The only problem I had with the b3 beta, once, it was pixelated, large, and flickered really bad. Closing Windows Media player and opening again fixed the problem.
It seems that the viz is more vibrant and colorful and exciting. That's what I have been hoping for, more excitement in the viz. The more the better!!
The only thing I can think to ask for, is an option to disable error messages when it has a problem with a flowfield, colormap, or waveshape. I don't want to see errors all over the viz when I am watching iti for enjoyment.