Yea I'm between these two now I like the di2, I think I would eventually put zipps 404 on either bike. And, if I got the the expert I would add di2 to it after wheelset upgrade. I'm just not that experienced at purchasing bikes at this end of the spectrum. $4000 is a lot of money for me so the bike will be my primary for the next 10 years probably. so far all my bike purchases have been under $1000. I know I want 11 speed so 2013 tarmac expert di2 is out. I hate the color choices for 2014 expert. Not sure How much 9r vs 10r frame stiffness matters. And I would want to change the crank on the comp di2. leaning copm di2 today, yet theres always tomorrow and I will probably change my mind.