Originally Posted by KantoBoy

I'd be surprised if there was any noticeable difference between the 2 other than you have an extra cog. If anyone says there's a perceived difference between shifting their on drugs or they're robots. The Ultegra and DA version should only differ in weight when it comes to the Di2 versions, not the mech.

I'm an owner of the "previous" version and can't find any flaws other than it's pretty heavy (not a weenie anyway). I'd take weight over losing 400g all day.