This is only my experience, but i had the XQ30s for around a week and i must say i have never been more dissapointed with a speaker. They look fantasticly good which is part of the reason i was interested in the first place. Unfortunatly the sound is brittle with no bass and very bright to my ears. I had a friend over and he could not believe i spent so much money on them. I returned them within a week. In complete honesty my b&w 685s to my ear were better and most of my friends agreed. Quite bad when you consider the price difference. Since then the only people i have had recommending them are dealers that stock them. Anyway i must stress that this is my experience and you should have a listen and make up your own mind. But be warned you need a powerful amp to make them sound anywhere near decent.
Cheers mate and good luck!