Rating: 
Summary: Fits your hand naturally - many useful features
Review: As a computer tech I am extremely picky about what input device I am going to use. I am extremely happy with the Marbleman FX trackball. I no longer have numbness in my wrist as a result of having my arm at an unnatural angle. The setup wizard also is very easy to use and lets you easily configure the marbleman to your specific needs. The real testament to the ease of use was when I bought one for my Mom to use. She was able to set it up without calling me - a definite plus in my book.
Rating:
Summary: Love it!
Review: As a grad student, I use the computer 40+ hours a week sometimes. I was getting terrible hand cramps and arm and shoulder pain from using the traditional mouse that came with my system. I tried the Trackman FX on a hunch, because it looked the most different from the ordinary mouse, and seemed to offer much more flexibility in the repetitive hand movements. After I got used to moving my fingers instead of clutching and moving my whole wrist, I found that I loved the trackball, because NO PAIN! Now I can get my work done without having to take numerous breaks.
Rating:
Summary: Saves Space, Precision Tracking all in One Neat Package
Review: I am a college student and space is at a premium for me, so a trackball was the first option that I though of. I looked around and the company that I thought of first was Logitech, I knew that they make superior products. I love the trackball, it took a little while to get used to, but now I use it for everything. It can be a little twitchy and sometimes a little hard to use. I find that when I use it during Half-Life and other games that it can be VERY difficult to use. Overall the ball is good, especially when space is at a premium.
Rating:
Summary: An absolute must experience. Especially for mouse lovers.
Review: I am marveling at how smooth this trackball is. I just can't imagine having to go back to a mouse. I am buying one for the office right now as a matter of fact. The real reason I bought the first one was for use on a plane (forget using a mouse there and a finger pad is total frustration). What a nice suprise having the four programmable buttons - very cool indeed! The Logitech trackball is a must buy!!!!
Rating: 
Summary: Painful to Use - Returned Mine
Review: I bought the original Logitech Trackman Marble somewhere around a year ago and loved it. So, I jumped at the chance to "upgrade" to the new TrackMan Marble FX Trackball last week.Even though the design is reminiscent of the original Trackman Marble, actually using the mouse feels completely different, and not in a good way... I found the buttons intuitive and even after custom-mapping them, I find that their locations require me to "reach" or stop what I'm doing to find what used to be quite intuitive to me. Not good at all. I have medium-sized hands (for a woman) and so I don't think it's just that the mouse is to big for my hands. I also find that my right hand cramps up painfully after using the mouse for a few hours. This is very disturbing, considering that I've had issues with carpal tunnel syndrome a few years ago and this is the first time symptoms have flared up in about three years. I boxed this mouse up and pulled out the old original Trackman marble and surprisingly enough, the pain went away. If you buy this one, keep the receipt until you've used it for awhile and are certain that it'll work for you.
Rating:
Summary: Laptop owners be wary
Review: I bought this device and tried to install it with a Dell laptop. What Logitech fails to tell you, until you spend 1 hour on a tech support call, is that this device does not work with laptops with Synaptics touchpads or docking stations. This of course comes out right after following the tech support guy's directions which also fried my machine -- he never bothered to ask these questions up front.
Rating:
Summary: Make them again, Logitech!
Review: I bought this mouse 8 years ago. In the last couple months, the right mouse button has been becoming unresponsive, and nothing I do seems to be able to get it back on track again. Now, we're talking 8 years here, I've gotten more than the $70 I paid for it back then out of it in that time. Pros:
Ergonomic
Precise control
Doesn't need a mouse pad, or even the desk space needed to move a regular mouse around
No moving parts
Lasted me 8 years! Cons:
Your hand is right on the ball, so any dirt on your hands gets deposited. It is really painless to clean, though, just take out the ball and blowing inside will get most of the work done. It's designed so none of the dirt will actually get inside the components of the mouse.
Fourth mouse button not recognized as a fourth button by games, must be assigned to a key.
Takes a little getting used to, a couple days at the most, like the transition from a straight keyboard to one of those "natural" keyboards.
Logitech doesn't actually make it anymore - they make a wireless version, which I will NEVER used due to a bad experience with a logitech wireless keyboard and mouse dropping keystrokes and movements a mere inches from the wireless receiver.
Rating: 
Summary: Ideal Pointing Device for Elderly or Handicapped Users
Review: I bought this mouse for my mother. She is 80 years old and it was almost impossible for her to manage a mouse. She could not hold the mouse still while clicking. This track ball provides a resting place for her hand so she can move the ball, get her fingers off it and then click. Setting up one of the middle buttons for double clicking is also important. Since she has difficulty managing the double click sequence and double clicking with one button is 100% reliable. Without this device she would random drag the mouse while trying to click and double click and wind up doing very strange and frustrating things. This mouse isolates the movement of the cursor from the clicking actions which is essential for her. Everyone else who uses her system adapts very quickly. It is not a problem for mouse users.
Rating:
Summary: Better than average trackball
Review: I do digital image editing as a hobby, and I wanted to find an accurate input device to handle fine line editing. I tried two different Kensington trackballs, but both had problems whenever I used slow, flowing movements. Even with clean rollers, the ball would never roll smoothly enough for minute editing. Logitech's use of optical tracking make the motion nearly flawless, almost no straying, even with a pixel-wide brush. I agree that the setup of the ball and buttons requires a bit getting used to, but the new hand position is more comfortable once you adapt to it. Others who are complaining about Carpal Tunnel Syndrome are probably trying to force their hand position to match the usual angle they've used with other trackballs. You need to look at the instructions to see how to rest the arm and wrist properly for this item. I only dropped a star off the rating because it's too dang expensive! It's worth it, but I wish they would give us a break.
Rating:
Summary: LOVE it at work, WANT one for home!
Review: I have been using the Trackman at work for over 6 months and it is THE best pointing device. I was beginning to experience the symptoms of carpal tunnel and the onsite ergonomics department offered this as one option. It was a little difficult to get used to, and the mouse users in the office find my Trackman difficult to use but I love it so much I want to get one for my home.
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