I am using it right now actually. Pretty fast, but haven't done too much searching around online to see its true potential. Hasn't crashed on me yet, so that's good at least. I have only been searching MacRumors since I got it.
Apparently it's just the name for the next update to firefox 3. However I must say it does feel a bit snappier, although all I've really tried with it is opening up pretty much all my bookmarks in tabs...
For those who are using it right now, do you find the pictures and specifically image content on websites is a tad raw? i.e. not as smooth around the edges as in Firefox? Thats the only gripe for me right now.