I have the standard GA645 and the one with the wide lens. Both bought used 22 and 20 years ago*. Never had a problem.
The only fault they have, they do not focus precise at short distances (up to 3-4 meters). You still can use them for portrait but have to remember to look which distance it displays in the finder. If it is unreasonable long, try again, maybe the AF finds the correct distance. If not, you can (kinda) focus manually. The problem is, at longer distances the AF is precise, so you forget to check every time and will have some malfocused close range pictures.
* After reading the extensive, to the point, excellent review on the old (black background) Fred Miranda site. I only regret, being a purist back then, not having bought the zoom version too.