I ride a Scattante and absolutely love it. It's 105 equipped but I don't get caught up in the weight-weenie stuff....here's my thinking; I could spend alot more $$$ to shave off 3 or 4 lbs (and yes probably get a little smoother shift) or I could take care of myself and lose 5 lbs and save alot of money.
I still say go for it though, you'll definately notice a difference over what you're riding now.