We rented a margarita machine from Mr. Margarita - Houston, and the service was horrible. They delivered a dirty machine (stawberry seeds left over from last user's strawberry daiquiries) and a dirty mixing bucket (dead spider inside), so I had to spend 30 mins. cleaning the equipment before use. Had the deliveryman set up the first batch as promised, he would have known this. After the party, they charged my credit card for returned mixes. When I contacted Mr. Margarita for a refund on the returned mixes, I was told that I would have to wait for the owner to issue a check, despite the fact that the money had been debited from my checking account several days before the call. On the bright side, the margaritas were really yummy, when they froze 1.5 hours (not 45 mins.) later! Bottom line: check the equipment and your credit debit card statement.
Pros: Tasty frozen margaritas!
Cons: Dirty equipment & poor service