We rented a minivan from Hotwire for spring break and wound up with Alamo. Normally, I go with codes and so forth to find the best deal ... but the Hotwire price beat the best code I could find by about $80 (and the best code was for a full size, Hotwire was for minivan).
It was fine. In fact, it was the fastest rental car pick up we've ever had at MCO! DH had the car paperwork before our luggage was even off the conveyer belt ... usually, I get the luggage and then sit and wait (and wait and wait ...) while he picks up the rental.
I knew I was bidding on an in terminal rental, so I really wasn't worried about that aspect. I did read a really cruddy review of hotwire car rentals when I googled before taking the plunge ... but my experience was perfectly fine.