We purchased a C-Max Energi 2 weeks ago. Getting it set up to tow next week. Went with the Ready Brake. Obviously can't speak to towing yet, but we absolutely love the car. We are getting fantastic gas mileage, and it is an extremely comfortable car. It was the only one we looked at that had ample headroom, so we didn't bash our heads every time we got in it!! :) We still have 3/4 of the tank of gas the dealer gave us after driving nearly 300 miles! For most of our daily errands we just use the EV mode, and then come home and charge again!! EV mode works out to about 4 cents a mile!!!!
We originally looked at the C-Max SEL Hybrid, but found we could go to the Energi for just a little more. When you factor in the $4007 tax credit on the Energi, it became a no brainer for us!! However, you do lose more storage in the back to the bigger batteries. Both rear seats also fold flat. Since we have a mini van and truck for large loads that wasn't an issue for us, but it might be a consideration for you.