Hi Minacross,
For a preview edition it is excellent. Now with DrWeb prelink-scanner inside it is even better. I havehad it from the start, like Neal63 has, and we are both very satisfied.
I think it is even better than FF 1.5 on which shoulders it was built by Bart Decrem and associates with a funding from Bessemers' of a milion bucks. I personally am involved in the security of the beast. I expect it to do even better now. Hop onto this browser, whenever you feel ready, but it is that stable you can give it a try now, if you like. If you dare download one of the nightly builds.
My view: best Californian browser ever, lean, mean, fast,
polonus