@Franko
I think the potential problems come more from a heavily expanded amiga. Simple accelerator, hdd and optical drive based systems (plus zorro cards if theyre available) are usually nice and reliable. Start adding "hack" based upgrades and things can start being a bit less friendly. Well, that's the general rule of thumb at least. I was a bit more lucky myself, but if friends experiences are anything to go by I was the exception. My grex1200 got pretty hot, but it was quite reliable.
Thinking about it though I did have trouble with my sx-1 module. It'd only detect when it felt like it, and the enable/disable switch did absolutely nothing (it'd still work when disabled, or not work when it was enabled, or vice versa, depending on its mood).
As for retro/not retro, I dont think that's particularly in the eye of the beholder, but rather dictated by the state of current technology. Even the absolute most expanded classic amiga is closer to a commodore64 in terms of spec than it is to anything rleased in the last 5 years. Nostalgia however is more a personal thing.