Advice on Purchasing an HP

[burgarwulf]

Hi all, just stumbled onto this site looking for some info on the amazing HP calculators.

Recently had a sour eBay experience buying a 28S, was sold as working but one of the rows was completely dead. Did get a full refund but I'm a bit disappointed with the lack of access to the internals of the calculator.

I'd really like to have one, but I worry that in the long run it will suffer the same fate and become more of a display item than the working piece of history I'd prefer it to be.

So I'm just curious if any of the other models are a bit easier to maintain? I have no issue spending the money on a nice one but I'm concerned of its longevity.