Before I had the OB subwoofers completed, I used the NX-Oticas on their own for a couple of weeks. If I wasn't familiar with the recordings I was listening to, I'm not sure I would have noticed any significant low-frequency deficit. But my room has very little natural bass absorption at the front end of the room (stone floor, cinderblock walls). And as Jay (Captainhemo) mentioned, if you are using software that provides DSP functionality, you can always add a bit of low frequency boost to extend the frequency response a bit lower.
The NX-Oticas (any dipole speakers for that matter) will sound their best if placed well out into the room. Danny indicates a minimum of 3ft, but they will provide a more open, airy, and deeper sound stage with a few more feet of air behind them.
If you've got the room to bring the speakers out from the walls (particularly the front wall) and don't mind their look from the back from your dining table, then I'd say go for it. You'll probably want to add some treatment to your walls behind the speakers - at least some drapes in front of the glass.