HP35s any good for EE?

[spaff]

Firstly, hello!

Secondly, I've been recommended an HP RPN calculator by a friend. After doing some research, it looks like the HP35s is good enough for what I need. I'm currently using a Casio FX991MS and TBH it sucks, is worn out, has no persistent memory and the matrix implementation is pretty poor. I tried Casio's mid-range 9750G but all I can say is "meh" and I borrowed an HP50g but it's too easy to get lost in that and you can't hold the entire model of the machine in your head without years of work with it. Also borrowed a TI nSpire and I'd rather gouge my eyes out than use it again - everything is painful. TI 89 has been written off as too complicated plus I don't need a CAS (just mech pencil and a brain). Linear regression would be useful. I also don't need graphing ability so would rather something a bit smaller than a full graphic calculator. PC eliminated as well as input is clumsy.

I do a lot of analogue EE work and tend to use quite complex functionality i.e. matrix determinants, solver, numeric integration, complex numbers (polar/rect and converting between them) and heavy use of engineering notation.

I did read somewhere about some problems with them but I'm wondering if that's going to be an issue for my use cases or if they have been resolved since.

Is this going to be suitable, reliable and reasonably accurate in your professional opinions?