Looks like a solid bike, can't go wrong with shimano groupset, especially Ultegra.
One thing to look at carefully with 2nd hand carbon bikes... make sure that there are no cracks/any sign of damage, because when carbon fails, it fails badly, not good!
Take someone who has had experience with carbon bikes and knows what to look for as it can often be difficult to find signs of damage. Any stickers or paint that looks out of place is likely to be covering something...