I think that they would be very usable as surrounds. Would they work as well as Q4s, for films probably not as well, for DVD Audio or SACD they would be fine if you understand their bass and volume limitations. It all depends on your budget. There is no question that M22s and QS4s are superior speakers, but if they are unaffordable it does not matter how good they sound. In either case you will require a subwoofer for a complete sound. If a sub is not in your plans for the next while then you may want to see if you can afford a pair of M3s. They will sound fine without a sub in the short term. They will also be excellent when you expand your system.
