In reply to alps_p:
If you are thinking of doing the better Costantini variant (about E3 4b) at the top then bring some small tricams - they were invented in the Dolomites for a reason.
Belays are two or three rusty old pegs in rubbish rock, which is pretty much what all the belays are up the harder bottom half of the route. Guides are happy to let their clients second belaying direct off these, and so would I be. But then the guides, who have the route dialed, lead, so the risk of a fall direct onto the belay is very low. I didn't see a single belay that I thought would hold a proper factor 2 fall. So be careful.
In the bottom half of the Comici there is no need to place any trad gear at all, plenty of pegs of various quality, but you might need quite a few QDs (15 or so?).
Good luck!