I do. After my first experiance, I wouldn't move in without one. There's some money in setting up the woods, but mostly it's the time involved. The big ticket items are the tank/pump/releaser and they can be easily removed. If you think about it the tubing's fairly cheap.

Send me a PM with your email address and I'll send it to you. It's the standard UVM lease form modified a bit to suit our circumstances.