The Bobkin Snrs had a few, but got lucky and wouldn't really describe them as being forced into it. Although I remember going along with them to one of the 'open days' and it was pretty full on. I think they've still got one for a really nice place in Scotland, but are in the process of getting rid.
Meanwhile, here's an excellent piece on them and the hell that some people go through trying to rid themselves of timeshares: