Bryston 7Bst vs 7B3

I am running a 4bsst2 as a centre after a previous 7bsst. The sound is better - slightly cleaner and tighter. The same difference when I moved from 14Bsst2 to 28bsst2 monoblocks (also better at lower volumes). I missed a trick here as I bought the 28bsst2s believing them to be the latest bees knees models, only finding out  6 months later of the sst3s! 
The comments I have seen say that there is a sonic improvement moving up from say 28bsst2s to 28bsst3s - but nobody has defined exactly what that is for us listeners. Easy to say, but not easy to define. I presume more of the same type of improvements moving from s to 2s
And is a 4b3 bridged better (and more flexible)  than a 7b3? Too many questions.

well, not to be rude here, but i can't stress this enough; you gotta go out and audiion, preferably a home audition. if the dealer gives you static, go to another dealer or call bryston and see if they can help you out...and to add to this is most reviews should be taken with a grain of salt...every component i've bought over the last 30 years based on a stellar review was a dud. this including some very highly regarded stuff.one exception was the b&w 801 matrix 2. great speaker that has stood the test of time, imo.

as a bryston owner...i feel that bryston does not suck. compared to pass labs, accuphase, fm acoustics, sdoulution, burmester, mcintosh, etc...maybe not, but there's really noting that wrong with the equipment per se. i can tell you from a reliability standpoint, it is the best, or 1 of the best, imo! so, im gonna go out on a limb here and say that the b3's are pretty cool, and at least sound noticably better than my sst (not sst2) model, the 4B.

Many Thanks! 2bz

I am seriously considering the Bryston integrated amp.  I have heard the separates on many occasions, have any of you guys heard the B-135?

Thank You- givin2u

very interesting combo you have going on there;
CJ, Adcom and MIT.  I love CJ gear and would love to demo their newest integrated amp.

Previous owned Adcom- always very good. Have never demo'ed M.I.T. cabling?