Have been using it the last two days and feature-wise it isn't all that amazing. I don't agree with it being a laggier version of Chrome. It has been lightning quick for me so far.
The Reader function is also quite nice as it lets you focus on the article rather than all the stuff around it.
I would have to wait and see what kinds of extensions it gets before passing any real judgement. But at the moment I would say it is a good solid, quick, clean-looking browser. Though nothing new since good solid, quick, clean-looking browsers have been around for years.
I will probably be going back to Firefox soon, though I am tempted to give the new version of Opera a go.