I'm still in stereo and using a pair of nOrh Le Amp 2 monoblocks to power my Maggie 1.6QRs. The combination sounds terrific to me but I haven't heard any others so can't compare them.
For the benefit of the curious, you can find out about the company at nOrh.com. It's in Thailand and run by an American expat named Michael Barnes. His monthly newsletter is often fun to read. The Le Amp 2 uses a switching power supply and runs Class A at lower power levels. 200w into 8 ohms and 400 into 4 ohms which is where the Maggies live. Absolutely no hum but they run hot. $300 each including shipping from Thailand. How they compare with the Outlaw 220 would be interesting to find out.