Rating: 
Summary: Canon BC-21e is a SHAM
Review: ... The BC-21e does not last for 20 tanks, more like 3 or 4. Canon cartridges have become too expensive for me to use. I'm buying an HP.
Rating:
Summary: Thanks for saving me money and hassels!
Review: After reading the other reviews, I've decided to box up this
BJC2110 and drop it off at the thrift store. HP here I come! Use a HP Desk Jet 990CSE at work and it's the cat's meow.
Rating:
Summary: Does Not Last
Review: Canon claims this cartridge last for 20 tanks of ink. It does not ! More like 5 tanks. Other Canon users have complained about this product also.
Rating:
Summary: This is just pure garbage
Review: Canon makes things that look good in the store, seem reasonable on the price, but when you take them home, they fall apart. Such is the case with the BC-21e cartridge. This thing cost as much as the printer itself, and mine FAILED after only 3 replacements. I don't abuse my equipment. I use it for normal tasks. Canon's product was just not ready for regular use.It would be nice if most people are as fortunate as the last reviewer, who has been able to use this past 5 ink-cartridge changes. Unfortunately, from my experience, I think that's more the exception to the rule. Stay away from Canon. It's a roll of the dice that you are probably going to end up losing.
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Summary: Disposable society loves Canon printers and inks
Review: I have a Canon model BJC 3000 and a model BJC 4200. Both are very functional and on their way to the trash. The replacement ink cartridge carrier in both cases failed and each costs more to replace than TWO new Lexmark printers (Lexmark model Z600 is $24.99 *including inks* at WalMart). There's something terribly wrong with this. It was irresponsible of Canon to engineer a frail circuit (subject to corrosion from ink) into its print cartridge carriers. I hate sending all this plastic to the dump.
Rating: 
Summary: It has worked well for me
Review: I have been using this product on a Canon BJC 4200 for several years now and have not had any problems with it. I have replaced the ink tanks (both tricolor and black) many times and have continued using the same base. I don't know if I've replaced the ink tanks 20 times, but certainly more than 4 or 5. I find that its cheaper in the long run than on other printers which require a whole new cartridge. Also, I don't have to worry about the black running out before the colors or vice-versa because the ink tanks are separate.
Rating:
Summary: Nothing but trouble
Review: I have owned a Cannon BJC-4100 printer and now have a BJC-5000. Low price was the main reason I purchased them but for the troubles I am having with the print cartridges I am going to purchase anything but a Cannon printer.
First of all, when ever the ink tanks run out you either install a new one right away or end up with a line across every picture you print. This is actually the best you can expect be cause the other thing that can happen is the print head gets gummed up with ink that drags across the paper making a big mess.
Secondly, any long periods of inactivity causes one or all of the colors to stop printing even with full tanks leaving to other choice but to replace the entire print head assembly.
Lastly, no matter how much cheaper the color and black ink cartridges are than the print head, after two or three cartridge changes the print head is shot costing ... if you have a BJC-5000.
Maybe other Cannon print catridges are better, but I can't afford to find out.
Rating:
Summary: Disappointing Cartridge
Review: I maintain and use 5 printers that use the Canon BC-21e cartridge. These cartridges sometimes fail before the replaceable ink tanks are empty to a maximum of 5 tank changes (using genuine Canon BCI-21 ink tanks). The longest life that I have seen is by refilling the tanks before they run out(between 3 and 10 refills).I have been using Canon bubble jets since the BJ10ex and have had few problems apart from the short life of the BC-21e cartridge. I don't know what actually fails in the print heads but they generally fail with the printer unable to detect the cartridge type and refusing to operate until a replacement is fitted.
Rating: 
Summary: Question/Suggestion About Cartridge Handling
Review: I too find myself with an aggravating situation: my BJC-4300 printer is complaining that my fairly-new BC-21e cartridge is not really a BC-21e. Looks like I have to buy another one. But I have a question: does it make a difference if one removes the cartridge to install ink tanks (as the directions say), or if one installs the tank with the cartridge still in place (as I did)? I'm wondering if this is what affects the lifespan of the cartridge. There must be a reason why some get longer cartridge life while others do not.
Rating:
Summary: Question/Suggestion About Cartridge Handling
Review: I too find myself with an aggravating situation: my BJC-4300 printer is complaining that my fairly-new BC-21e cartridge is not really a BC-21e. Looks like I have to buy another one. But I have a question: does it make a difference if one removes the cartridge to install ink tanks (as the directions say), or if one installs the tank with the cartridge still in place (as I did)? I'm wondering if this is what affects the lifespan of the cartridge. There must be a reason why some get longer cartridge life while others do not.
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