I have had my time with Android. I have used SE Xperia Arc, Samsung Galaxy S2. And currently having an N9 (Wonderful Experience)

But it just doesn't feel right. My room-mate has a SGS 2 and in spite of having a Dual-Core processor, feels like lagging :/ . Powerful processors aren't used effectively I reckon. Might as well provide a reactor to Android, I doubt it will be effective.
Apps and ecosystem are exceptions.

Bottomline, just doesn't feel right.