General opinion about ADCOM amplifiers

My first amp was an Adcom 535 Mk. II which I have since given to my brother to use. However I feel that it is still an awesome value. It has never given me one once of trouble in the 10 years that I've owned it. The sound is a little on the harsh side but for $250 I can't complain about it. Its 60 watts/channel is adequate for most speakers. I used it with NHT 2.5i's with no problems at all.

I use the 555mkII in bridged mono(two of them).They each power one 15" sub apiece.They crush.Quiet,no fans and used about 400.00 each.My two cents.

Adcom 5802 is my best value purchase to date. < $900 on ebay, in pristine shape. I have no experience with modern high-end stuff, so can't debate inaudible subtleties with anyone, but comparing to the Denon AVR-3803 receiver I had been using with my Maggies: piano used to clank, now piano sings. Sweet, natural, open, refined all come to mind. A great match for Maggies. I have a sub, so amp only boosts frequencies above 60Hz, but from what I've read, it excels in deep bass.
Runs hot and no trigger on/off are two most significant issues to consider. Also size and weight.

This amp is really a great bargain. It makes a big difference in my system.

I used to own an Adcom 545 that I used to drive a pair of small Magneplanars. It was a very satisfactory amplifier, quite reliable as well. I don't think the Belles 150a Hot Rod that replaced it sounded any better with Magneplanars. The adcom preamp/tuner paired with the amp at the time was MUCH less musical than the amp. An inexpensive Cambridge preamp pounded it sonically. Having talked with other Adcom owners, I've heard the same sentiments as well. Good value, musical power amps, rather mediocre sonics on many of their preamps.

I owned two Adcom GFA-5802 power amps. I used an Adcom GFP-750 preamp with them. There was a great synergy with these units.
The Adcom GFA-5802 is a great sounding amp, especially for its asking price! Better than I expected!
It had a smooth, open, warm, and very natural sound in my system. One area where it really excelled in my particular system was in midrange presence, clarity, and vocal reproduction, especially on female vocals. It also seemed to have a sort of a BIG sound to it. The treble was also very smooth, and grainless in my system. The bass was very good, but not outstanding.
In terms of midrange and vocal presence and clarity, they rival or beat any amp I have ever listened to in my system, including the Carver A-760x, McCormack DNA-225, Parasound HCA-3500, Pass Labs X-350, and even my Parasound Halo JC-1 mono-blocks! With a few improvements to its basic design and some higher quality parts, this could be a KILLER AMP!
The only real weaknesses in my system were the bass tightness and extension, a slight lack of snap, extension, and sparkle in the top-end, a slightly narrow soundstage, and just a tad too much warmth.They also get HOT to the touch.
Keep in mind that these results were with its matching Adcom GFP-750 preamp. The results may vary greatly with other preamps, speakers, or in other systems.
I came EXTREMELY CLOSE to keeping this combination! I still miss the EXCEPTIONAL midrange naturalness, openness, and vocal presence they produced in spades! I wonder if I'll ever achieve it again? It was that good!
Has anyone else out there who has owned the Adcom amp and preamp noticed these same strengths with this combo?