I received the M3i from Audio Advisor a few days ago, and it is very very impressive; I was NOT 

prepared for this kind of sound quality from a $1500 amplfier. It has excellent bass and the realistic

balance between instruments in a jazz combo or small classical group is stunning; it is so 

listenable and presents such a fine stereo image that it closely approaches the amp and preamp 

at my other home, which cost well over $10,000 currently. I was hoping for a significant improvement

over my old amp; instead I got two orders of magnitude of improvement; wow!

This amplifier is a real steal; the best thing I have heard for less than $4000.

For $4500, the Audio Research VSi60 probably sounds a bit better, but it does have less power and

is far too large for the physical space I have available (and besides...I swore off of power tubes years ago...lol).