From a post of mine in a similar thread:
"I like it better. So much so I've made it my default browser. Better UI than MicroB to me. Really nice to have true tabbed browsing, real < > buttons, the usual Firefox extensions like Adblock Plus, etc. Nokia seems to like it too, they're featuring it: http://maemo.nokia.com/

The nightly testing builds are adding more features and speed all the time. Probably won' be too long and we'll get an upgraded version that will really make it nice."

I have tweaked it a bit - enabled flash, doubled the cache from 1024 to 2048 - a little this and that. Been very stable for me and just as fast as MicroB once it gets going (doesn't pre-load into memory at boot-up like MicroB so takes 4-5 seconds to open).