It's definitely not junk. Incomplete at worst. Once I got over the initial sticker shock, I realized it's a pretty good deal. A $14 Stormtrooper, a $7 Han in Carbonite and $29 display. It's good quality, and it's fairly screen accurate, with a lot of potential. Hasbro should stop calling things like this "playsets", I think that's confusing people. It's a display, or a Diorama base. There's a big difference, it's not just semantics. There's actually a big difference between a Diorama and a display. A diorama tells a story, while a display is just a display.
I like that you have the option of buying one or two. If you want to recreate Luke and Vader's duel on top of the staircase it would be perfect just to buy one. You don't need anything more than that. Add some lights underneath, and a blue backdrop, and it's a cool little display. Take pictures and Photoshop in lightsabers. A lot of potential even if you only buy one.
I might buy two, and really fix it up. Make a more screen accurate base, and a ceiling. Only if. It fits in a bookshelf. If it fits in a bookshelf like I'm hoping it will, that would be incredible. If not, I really see no need for two. For me that's the determining factor. Bookshelves are pretty standard, so it will either fit or not. So I'll probably buy one, see how it fits on a shelf, and go from there. If it's much bigger than I anticipate, I'll just put Luke and Vader on it.