We stayed at Sum Suites LBV in Sept 2000 on a long weekend trip (FWIW, we were placed there by Priceline). We all were very impressed. The rooms are very comfortable and the hotel is nice and clean. The "Deluxe" continental breakfast is very good (you can get pay extra for a cooked-to-order omelet) and the location can't be beat.
The only minor thing even worth mentioning is that all of the suites are painted pink (think Peptol-Bismol). Must be trying for the Florida/Breezy look.
If you can live with the pink walls, I believe you will be very pleased with this hotel. I will try to answer any specific questions you may have.
Epscot