They're not something I'm fond of... I think with some work, the DS one could be modified if you had a few (the hallways that is) into something longer and more accurate to a cut-away of the Death Star Hallway.
The swing to freedom is meh... Has some doors though. For customizing it's maybe useful.
The Endor and Hoth sets are, to me, pointless and worth nothing to little... They're tiny, and just don't look right to me. The bunker door matches SW miniatures, and the gun turret for Hoth does somewhat, but they're weak.
If there was a decent SW playset (to me), it's the Theed Generator... It's fairly accurate in details, it's a decent size, it's for an action sequence everyone loved... I think it's pretty good. You get a couple and put them together, and they look pretty decent.