I have recently had the 0 key break on two different 12Cs. These were relatively new calculators < 2-3 years old. Has anyone else had this issue? I would use the TI but I don’t think I could ever go back to regular algebraic input.
no… but then again, I don’t have the need to use the 0 key excessively when computing with my base salary as input 
when i hit my 0 key, it sometimes enters double 0… sticky key i guess.
I have 2 of them (one personal and one work). Both are 10+ years old and have never had a problem. I think they’re quite a bit heavier than the newer ones, so they probably are not as well made anymore.
I also have two of them, one 20 years old and the other 15 years old never had a problem with either of them other than needing to change the batteries.
No, I haven’t had that problem either. Platinum.