I received 5 M200s two days ago (5.1) and now have them calibrated. These are very under-rated in the press. They are driving 4 Ohm speakers by Dynaudio at 90 dB levels with ease. There is no heat build-up, a question I see asked frequently, even though 3 are stacked (surrounds + center) and 2 are stacked, playing the front mains. The amps are wonderful, with detail, very quiet in quiet passages, loud without being harsh or tiring, and very quick and dynamic with percussion. It is nice having five identical amps with their own power supply. Steve was great to talk to when I ordered them, and all of you have been helpful in this forum. Thanks to Outlaw for offering a great (and inexpensive) amplifier and great support. It will probably be a long night while I play with my music collection! I heartily recommend these amplifiers to anyone even considering a new purchase of amplifiers. Come to my house and hear for yourself!