A500+: You couldn't expand it with normal A500-expansions, and It had incompatability issues.
The A600 wasn't great, but it sure kept me running.
I had one with 270 Mb hard drive, 2 Mb chip-RAM, 4 Mb fast RAM, and OS 3.1.
I was so happy about it, that I bough another one when it broke. Unfortunately, the new machine only had OS 2.04 and was never put to very much use. :-(