Calculators you regret buying?

[polbit]

(12-10-2023 07:20 PM)Bill Duncan Wrote:  Probably the HP-28C which I bought used. It's the only one in my collection that no longer works. The clamshell design was a poor design iMO.

As 28C started my love of RPN/RPL, I have to defend its' honor The layout was really great for program entry, it was actually hard to get used to the 48. Of course 28C had such limited memory that it was more of a demo of what was possible, until 28S came out.

I do have few of both, and they all work perfectly, with only one having the battery door issue.