Indeed it is, I have one (well almost M1 rears instead of 684s) and it's an excellent home cinema system. Before I can recommend it heartily though, they need an audition to make sure they work for you musically as, from other forum posts I've seen, they're not to everyone's tastes.
Maciek - Floorstanding speakers aren't necessarily better than stand mount speakers, but either is definitely better than a style package at the same price range like the Bose (if this is what you're meaning by small speakers?). Whether you go for floorstanders or stand mounts really depends on your room size. At that budget, definitely check out the B&W 685 Home Theatre for a stand mount system or the Monitor Audio BR5 package for a floorstanding package.
NB - these are just a couple of suggestions, there's a wealth of choice out there around this price!