I've been using it since last night. It seems fine except for font conflicts. Some of the text appears garbled or as if it was in a strange alien symbol-font. This is not unusual. In fact, there have been garbled fonts since OSX first arrived. It's my single biggest complaint against Apple.
I don't understand how they can continue to release software that embeds Apple's dfonts that conflict with professionals who own (better) versions of the same fonts. I must have resolved this conflict 20 different times over the past 5 years, and every time requires hunting for the offending font. In the past it has been (to name a few) Helvetica, Helvetica Fractions, Bell Gothic, and now it seems to be Lucida Grande and Times that cause the problem. AAARRRGGHH! I fixed mine by removing the offending duplicate fonts (Times family) and now everything displays correctly.
Otherwise, I quite like the display of frequently visited pages which allows pretty fast access, maybe even faster than using a bookmark bar link. The only thing about it is, the pages show up for all to see and I have to be careful my wife doesn't walk by and see the "Sexy Seniors" page.