Originally Posted by Lfctony
It works quickly and smoothly even if you do jailbreak, as long as you don't keep installing crap on it... Even if only to install SBSettings. The functionality the tweak offers should have been there from day one in the OS...
I don't have an iPhone (yet) so I can't say much on SBSettings. And yes, iOS is a very fast and smooth OS, actually the fastest and smoothest IMO.