I've been using it since the beta came out and I like it a lot! Haven't tried the final release yet though...
- blue progress bar was better before, the spinning wheel is too invisible for me, sometimes i find myself wondering if I had clicked a link or not
- tabs take some getting used to, seems less intuitive to move them around
- favorite sites, it tried using it in the beginning but can't. I prefer opening my tabs all at once. Can we put a folder of bookmarks in there?
Other then that, it's really a great improvement on the v.3
It seems like I was one of few who did, but I like tabs on top in the Safari 4 Beta. But I guess I can get used to them on the bottom again. I'm loving the clean new interface, and the new loading and RSS buttons are quite snazzy. Overall.. I like it quite a bit.
Savio - You can still take tabs out and make new windows - I just tried. I've never known that you could insert tabs, though.