This is far from objective analysis, but since I purchased my first set of B&K M200 monoblocks, I've yet to find a stereo amp that can touch them . . . and the unit's I've compared to cost me anywhere from 1.5 - 2 times as much as I paid for the M200s pair.
The form factor has advantages (eg, running shorter speaker cables, location), and disadvantages (eg, size)
The form factor has advantages (eg, running shorter speaker cables, location), and disadvantages (eg, size)