I stayed at the (now) Clarion three times in the past six weeks (as nothing Vacation Club was available on the kind of notice I was able to give), and found it very clean, well-furnished, and convenient. I never used the shuttle so I can't speak to that. The $39 rate was untouchable.
Three criticisms:
I-4 road noise on the south/east sides of the building is close to intolerable. I'm a very heavy sleeper and it woke me repeatedly, and didn't let up all night.
The breakfast buffet isn't worth free. Service was chaotic, and the food was dead and tasteless. It wasn't dirty or inedible, though.
The elevators chronically stop working. You'll get various explanations why (leaves in the door tracks, sunspots, ghosts), but it always seems to affect both elevators at the same time and takes at least a day to fix. Be prepared to climb stairs.