We have seen them. We would not want one but if the rate is good and it suits you go for it. It's funny, but they have offered the best rates. I would love to take a chance and book one at the low rate (and not have them available) but in the summer, Alamo had 5 in their aisle.
I have seen them in the full size aisle the last few trips we took. My DH wanted to take one 2 weeks ago but we ended up taking a regular car with only 1,000 miles on it. I love the new cars at MCO!
For a quick weekend trip this coming June, the best rate I have seen is for a pickup. I reserved it because its the cheapest option, and clearly DH has no problem driving one, so we may end up with one.