I never trust all this Time sharing vacation thing, my experiences is that you will never fully enjoy the benefit promised.

For example, some hotel will allocated certain number of rooms for Time sharing only, and a lot of limitation, like only weekday only etc etc, so like you guy experienced, most of the time, you will not able to get the room you wanted.

please take note that some of the time sharing vacation plan is actually managed by third party rather than the hotel itself.