I heard these in a 5.x surround system. They were the side/rears. Mains were Monsoons. I heard them at shows quite a few years bach, too.
If you're a planar person you'll be happy. If your not a planar person you'll be happy. I really haven't used anything I liked as much as planars.
The slim profile really isn't affected by BIG bass as much as normal round drivers are. Planars are fast, very fast. They can have a brightness if your not aware. HF treatment in a room is something to think about. If you have lot of really blank walls, they will show you all about it.
They do require a good amp, not a lot of watts, though..
I've had RD75s, Strathearns, and have, Neo 8, Neo10, and Monsoons neo 8s, All in different builds. This model has 50" of planar. That will fill a pretty good size room...
I'd inspect them look close, make sure they aren't stretched, they should look good, if not walk away.. Pretty high SPL too, they can play amazingly loud, protect those ears...
Regards