Rating: 
Summary: 1 key fails
Review: After spending hundreds of dollars on this phone system, I'm in the market again. What a waste of time and money.
Rating: 
Summary: Best 4-line phone out there
Review: I bought this for my home office - we have 2 home lines, a fax/dsl and a business line. This phone pretty much does it all - you can answer each line with a different outgoing message, set up mail boxes for different people, and even have different lines ring on different handsets, or not ring at all (i.e. the fax). The range is very good (I can usually get it to go about 400 feet outdoors in a suburban neighborhood). The handsets are pretty much the same size as the Panasonic 2.4mHz standard. Battery life seems fine.My biggest peeve is that you can't use 2 handsets on the same line at the same time (I guess that is what the extension is for) and that one of the four handsets we got refuses to work properly - something with the battery, but Panasonic has been pretty helpful.
Rating:
Summary: Unreliable
Review: I have 4 of these with the base and currently three are dead. One just came back from repair and died again within a week. When this system works, it is wonderful. But with a 90 day warranty on the handsets, I am going broke replacing them.
Rating: 
Summary: Run away from this product! RUN AWAY!
Review: I regret my purchase of the Panasonic 4000B base-and-handsets two years ago, as it was useless right out of the box. So why am I writing this review 2 years after the fact? Because in moving recently, I rediscovered this $500 set of paperweights in a box where I'd stashed them after nearly going insane trying to make them work!
I'd had good luck with a Panasonic cordless previously, so the 4000B was my choice when I needed a feature-rich, expandable phone system for my small business. Um, wrong choice.
The god-awful battery problem, so frequently mentioned in Panasonic cordless reviews, rendered my handsets useless, and I mean USELESS! Talk-time was nil, and replacement batteries did nothing, (as did Panasonic customer service). Voice quality when speaking through the corded handset on the base was also mediocre (though speakerphone quality was very good - go figure.)
The less-than-intuitive operating system for the phone became a moot point since nothing worked anyway!
Look, I've had and still have various Panasonic stuff that works fine, but I can't stress enough what a dog this unit is. In addition, my only other review on Amazon is a scathing rip on another fatally-flawed Panasonic product (FP-155 fax machine), which has a design flaw (experienced by most of the reviewers)which turns it into - you guessed it - an expensive paperweight.
Panasonic, please consider this a wake-up call -- you're burning a lot of people with your poor engineering/design on some of these products, and losing an immense amount of goodwill.
Rating:
Summary: Buyer beware
Review: If you purchase this product, I hope you are completely satisfied. It is my opinion that the reliability of Panasonic products has slipped in recent years, and this was confirmed to me when a product I purchased quickly failed. The reason I'm posting this is to warn you that the warranty that accompanies Panasonic products only has value if the company chooses to stand behind it. In my case, they weaseled out of it, leaving me with a total loss and no further recourse. Good luck with your decision.
Rating: 
Summary: 1 key fails also - chronic problem
Review: My parents bought 2 of the handsets - both #1 keys failed. Mine lasted a little longer, but the #1 key is also failing. have even taken the blasted phone apart to try and get it to work to no avail. buyer beware.
Other than this nasty little problem, the phone is great.
Rating:
Summary: Decent but still some problems
Review: The first batteries had issues and did not hold their charge. Now, after 1 year, the 1 button won't push, so always trying to find a different phone that the 1 does work on. They have worked pretty decent for the past year, but they are really starting to fall apart. I guess they are too expensive to not work perfectly for a while, kind of a disappointment.
Rating:
Summary: The number 1 on the keypad stops working.
Review: The number 1 on the keypad stops working. And it does so right after the warranty expires. I have 4 handsets, had to replace 2 (about $80 each after warranty), now I need to replace the other two, plus one of the replacements started doing the same (after the 90 days warranty. Otherwise (when it works) a decent system, way better sound and range than Siemens. Draw your own conclusions.
Rating:
Summary: 1 key fails
Review: The phone system has alot of features but in year two I began to get complaints that callers could not hear us. We have four of the handsets around the house. We've never been able to get intelligent assistance from panasonic to help diagnose the problem. I don't know whether to replace the battery (although the batteries recharge as they are supposed to) or whether the handsets are simply failing or whether the problem is interference. Not a great phone for family use...better for business situations. For family use, it drives the children crazy that they can't simply pick up an extension when another family member has answered the phone elsewhere and the call is for them. They have to learn how to hit the transfer button AND which extension number to transfer to (which is problematic since the cordless phones float around the house!!).
Rating:
Summary: Callers complain they can't hear me!!!!
Review: The phone system has alot of features but in year two I began to get complaints that callers could not hear us. We have four of the handsets around the house. We've never been able to get intelligent assistance from panasonic to help diagnose the problem. I don't know whether to replace the battery (although the batteries recharge as they are supposed to) or whether the handsets are simply failing or whether the problem is interference. Not a great phone for family use...better for business situations. For family use, it drives the children crazy that they can't simply pick up an extension when another family member has answered the phone elsewhere and the call is for them. They have to learn how to hit the transfer button AND which extension number to transfer to (which is problematic since the cordless phones float around the house!!).
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