* No spellcheck in form fields (without a plugin, and I hate plugins).
* It feels slower. There's something about it that just doesn't feel as fast. Mostly things like opening windows etc.
* There's some annoying defaults.
* Dev tools aren't as good.
* Updates aren't installed automatically.
I mean, it's close to Chrome, which is good (for me), but it just feels about 5% less polished. It's good enough that I'll stick with it, after all there was a driving force for me to leave Chrome too.