I sure do.
I started out with a Heathkit AA-181 that I got from my dad when he bought a new Sansui receiver around 1970.
http://www.heathkit-museum.com/hifi/hvmaa-181.shtml
I bought my first piece of audio equipment in the mid 70's. It was a Pioneer SX-535 rated at 22 watts:
http://vintageelectronics.betamaxcollectors.com/pioneerstereoreceivermodelsx-535.html
Next was a Yamaha Natural Sound A-500 in March of 1984. I also bought Yamaha NS-1000 speakers, the Yamaha CD-2 CD player (single disc) a 3 head cassette deck and a Yamaha direct drive turntable.
http://www.radiomuseum.org/r/yamaha_natural_sound_stereo_amp_2.html
Mine was black.
When the Yamaha started to die in early 2000, I started looking around at new stereo gear (I had replaced the NS-1000's with the KEF Q70's in 1995), I was considering the Adcom GFA555II and the Parasound HC1000A or HC1500A. A co-worker said "I have the amp for you" and loaned me a late Bryston 4B that was THX certified for a long 4th of July weekend. He also had some interesting other gear including Spectral Amps and a Spectral CD transport. He's a big fan of the big Thiel speakers. He currently drives them with Goldmund mono blocks.
I borrowed the Bryston over a long 4th of July weekend. I used a Parasound PH-850 pre-amp (that I continue to use) to front end the Adcom, both Parasounds and the Bryston. I listened from the evening of July 3rd all the way through July 8th (a Sunday). I had to return the Parasound and Adcom amps on Monday, the 9th.
There was absolutely no comparison.
After that, I started looking for a Bryston dealer. I ended up purchasing mine, a 4B-ST, in Franklin, TN on the third Saturday in Sept, 2001.
The Bryston was amazing. It still astonishes me often.
HsvHeelFan