Simon, we didn't make it to Cozumel but we had no problems in Playa as all the businesses seemed to be back up and running. Did not see a lot of hotel damage there either, but like I said we stayed to the north of town. I did notice several ferry boats going back and forth to Cozumel.
The worst hit area seemed to be Puerto Aventuras which I was told was reopening the week after I was there. Lots of trees and fences down and all thatch gone on the resorts that had it.