Nordost Quantum Technology Products

Does anyone have any experience with either the QX2 or QX4? Not much in the archives and googling doesn't produce many results regarding if they work or what may be expected in sound quality. My local dealer would like to sell me one or 2 but does not have the units to demo. He has never steered me wrong but if this is such a great product I would expect to get more positive results at least when googling the item.
Thanks