i own a set of vandy 2ce sigs that i use in my 2-channel room. they are without a doubt the single highest-value bit of AV gear i have ever experienced. if you can deal with the size and the looks, you will (should) be absolutely astounded by their performance.
they are not 'laid back', they are neutral. they accurately reproduce what they are given. they can get plenty low, accurately. if you like 'high detail' (ie: bright) or think they lack low end...well, maybe they're not for you. for primarily theater use, if you want gut-busting punch, you will want a sub regardless of what speakers you run. in fact, i would agree that they are better suited to music than to theater.
they are a bit picky about placement in my experience. the manual is a great guide to start, but some experimentation helps. the best thing you can do for them is pull them well forward, off the wall and into the room. they can (and do) image with the best when properly placed. i find toe-in detrimental in my room.