I use Class D Audio amps I built from kits. My old Adcom 5 channel bit the dust, and I needed a low cost replacement. I made a three channel amp using two modules, sharing a common power supply. One module is in stereo mode for the surround speakers. The other is bridged to mono, for 500 Watts to the center.
I like this arrangement so much, I built another amp, using two modules bridged to mono, for 500 Wpc for my main speakers. Sounds ridiculously good, especially for the cost. I use this amp for 90% of my listening, an SET 300B for the remainder. They both sound good in my situation, though the modules that are bridged tend to be a bit noisy. They sound so good, I really don't mind.
Regards,
Dan