> Touchwiz is not a bad product, though it adds actually very few to stock experience.

Not anymore, anyway. But TouchWiz added quite a bit before ICS came out. Off the top of my head: a customisable dock bar, resizable widgets, a paginated app menu, the app switcher you get when holding 'home', power saving toggles in the notifications drop down...

Admittedly these days it's just a way for Samsung to put a unified, iPhone-like interface across all of its phones, but in the beginning it added a number of features missing from Android.