I was ready to purchase the M30.1 a few years ago to replace my Spendor BC-1s and s5e's, and this was after a one week home audition. I then had the opportunity to hear the Omega Super Alnico Monitor (SAM) and I couldn't get them out of my head. After a week or so of vacillating back and forth between the two, I pulled the trigger on the Omegas (at a savings of almost $3K). I have not looked back since - to my ears (and my wife's) the Omega's were the clear winner. Once broken in, they are amazing speakers with all sorts of music - I listen to jazz, chamber music, Americana, acoustic, symphonies, the Who, Pink Floyd, the National, ... The Omega's midrange to me beats that of the Harbeth. They have a solid foundation (amazing for a 6" single driver) probably because of the cabinet (although I have added some small subwoofers so I can get that lat extra bit of oomph from Mahler). I have never felt that the highs are lacking. To show them off to family and friends, I play "Keith Don't Go" from the Nils Lofgren Live disc, and everyone comes away shaking their heads on how good these speakers sound. Here s a link to an Audiogoner talking about his SAM.
https://forum.audiogon.com/discussions/three-weeks-with-omega-sam-s