Specialized S-Works Roubaix SL4

I am looking to upgrade to a better road bike and am seeing a Specialized S-Works Roubaix SL4 road bike on marketplace for $1800.

It has:

- Shimano Dura Ace Di2

- Zipp 303 Firecrest Clincher wheels

- Zipp carbon cockpit

- Enve carbon seatpost

Is this a good deal or can I do better?