Campy shifting is fantastic and very easy to get used to.
I am not a fan of Di2. Mostly for asthetic reasons. Di2 does not look good on a nice sleek bike. The motors are clunky looking and don't get you away from cables completely because you still have brake cables. So now you've got a pretty bike frame that's cluttered with motors and cables.
Also, there's something about the idea of a motor (albeit a small one in the shifter) on a bike that doesn't appeal to me.
Living life like there's no tomorrow.
http://gorgebikefitter.com/
2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS