Any Bryston 4B3 amp owners out there?

I have a couple of 4b sst2's - I like them very much but there is one thing that bugs me - at somewhat high volumes they begin to clip. I am using an anthem avm60 and they both clip when I am up to around -10db which is nowhere near the max of +10db. Not sure if anyone else has experienced this. Apart from that though they sound fantastic.

BTW have you considered the Mcintosh MC302? I need another 300W stereo amp and have been thinking about getting the 302. I've heard that is sounds detailed, warm and lush which is the sound I'm going for..

Love my 4B3 driving Maggie .7s.  Agree that a good preamp match is a must, but disagree that the pre needs to be a tube model.  I run a solid state Mark Levinson 326S pre and it is a wonderful match with the 4B3.

@professorsvsu,
Congratulations on the decision. Would love to read about your comparison between the A21 and the 4B3.

The second week in February I'll free up some cash and make my move. If the 4B3 doesn't please me, back to the drawing board. I'll certainly share my personal comparison between the A21 and 4B3. If I can just dig out some of the upper mids and highs that the A21 wants to bury and keep it's soundstage and bass, I'll be pleased. 

I own a 4B-ST and 4B-SST2, and both sound quite different.  Sort of a good thing though, as they match better or worse with different speakers.  The ST sounds more exciting, and maybe less refined.  It's lived most its life powering my B&W 801s2's, and is a great match for them.  The SST2 is too refined, and almost sounds compressed powering the 801's.  I've just had the 20yr old 4BST repaired & recapped by Bryston, and it was really worth it! (~$700)
The SST2 drives my pair of Tannoy 15's, and the low noise pays off there.  The ST is too harsh on the Tannoys.  It's all about system matching!  I borrowed a Parasound A23, and found it too bright.  I've not heard the A21 in my home.   I am SST3 curious, but not in the amp market now that my ST is restored!