I've had a pair of 500MBs for about four months now driving Maggie 3.6's on MYE stands. You can't go wrong! They are quite powerful and have a warmth about them that I've only heard from tube amps. Actually they sound very similar to the Counterpoint NP-220 they replaced. Just tighter bass and faster transients in the highs but the warmth is still there which is what I was really looking for and amazed to find. I occasionally pop the midrange fuse because it's hard to find that threshold where the sound degrades at very high volume. These things just get louder but with the same sound quality through out almost the entire range of volume. Once they are broken in I think you'll be very impressed.
Regards,
Danton
Regards,
Danton