Well, I have the 150 sitting between a pair of M22's. I honestly never had any problems with it. I sit about 8ft away from it and usually sit within the same 3-4ft area on my couch.
Now, I did just order a 160 but that wasn't really because I was dissatisfied with the 150. My main move is going from EP500's to 600's and getting them in a custom wood finish. So doing all the other speakers first including M22 to M5's. I decided to upgrade to the 600 only because I've heard so much good about it. Once I get it I'll let you know how much of a diff I hear. It will be about a month until they are shipped...that's my best guess for now.
