Six of us just made the Orlando to Cozumel trek and chose for economic reasons to fly to Cancun and take the land routr to Playa del Carmen and then the ferry.
We flew American from Orlando to Miami and then to Cancun. The per person air fare was approximately $315 as compared to about $615 per person to Cozumel.
We pre-booked a van for six with GET DITA for a round trip fee of $132 or about $22 per person round trip. The service was perfectly on time and, we felt, very reasonable for a private van.
The ferry is very modern and clean and cost us $10 per person each way. We didn't book the slightly cheaper round trip because there are two different ferry companies and we weren't sure which we would take for the return trip.
My only complaint was/is the Cancun airport on our April 8 return. It was absolutely a zoo with incredibly long lines. We did make our flight, however, and all went well. I hope the congestion was due to the Spring break timing.
Regardless, we are doing it again at the end of October.