I am running a pair of Theos with XA30.8. The sound is silky smooth (not syrupy), detailed and non-fatiguing. You just want to listen to music more and more.
I'd snap them up myself, but have all my cash going into the business. That, and the ESL stereo (300w per channel) powering the Monolith panels is doing an awesome job, even when pushed hard, it keeps up. But then, all it drives is the raw panel, no lossy crossover anymore.