Just started using GPA7 and I have to admit, it looks really good. The text looks much cleaner on my 15" SR MBP than Firefox. I'll start checking out some esoteric sites to see how it reacts. This should be fun...I hope.
----------------
EDIT: Okay, after a couple of hour's surfing I did notice one glaring issue. It loads pages very slowly, especially image heavy sites, flash based sites and script heavy sites.
It is still a very nice looking browser; however, I wonder when the real version will release.