I have tried it, it's actually quite good! It's definetly faster than firefox and it has a "Private Browsing" function which to some people could be quite useful. Shame that it's probably never going to leave beta stages.
I still prefer firefox though as I don't really need private browsing as I have my own computer in my room. My computer is completely protected from nosy parents with a BIOS password, user account password and all history is auto cleared after each session and to top it off I have a scheduled task to shred all history and cache at computer startup (delayed, as it takes about 40 seconds to complete) with a Guttman 35 Passes Algorithm.
Craig.