I've had a mid-80s MiniBrute II for about 5 yrs that I love and haven't had any trouble with it. The other night a friend came over to jam and brought his. It turned out to be an almost identical MBII of the same vintage and he's never had a problem either. They do have somewhat of a reputation for dying reverb units, but my experience has been very good. Harmony Central user reviews are mixed, but they have a "modern" jazz tone that's unbeatable and the reverb is great. Plenty of clean power too.
I bought mine used for under $300 on CL, a pretty good deal I think, but if you find a nice used one check the reverb before you hand over the dough. If everything is working it will probably keep working, they're built like tanks.