Interesting. I was going to start a thread on exactly the same subject today!
I have the 601 s3's and a REL Q100E which I use mostly for music (having sold an LCR600 and run out of money before falling for the 603's, lol). While they sound absolutely stunning, seriously exceeding my expectations despite a great demo and 5/5 reviews all over the place, next year I could be back in a dorm and might switch to a pair of 600's and a modest amp (NAD c320 or something similar).
I have never heard them, but would presume they are similar in character to the 601's (rear-ported though, right?). Being very neutral speakers as it is, I'm sure that upon first impression they will seem somewhat lacking in low-end (only a 12-13cm mid/bass driver, I think) but for the size probably can't be beaten. In fact I think it's nice that B&W didn't try to force the low-end on such a small unit. Of course, well-integrated with a decent sub in a small room they'll shine. You might find them slightly "monitor-like" though, not that that's a bad thing in many people's eyes.
It's probably best you go and have a listen. Bear in mind that they really, really improve when fully run in. Some people reckon 100 hours at least for the 600's and while that might be a slight exagerration it can't be far off. Nice little speakers, although you might want to consider 4 plus an LCR60 for centre duties.
I have read a lot of god things about the B&W range
and they seem like a quality speaker manufacturer.
The drivers might be small, but when you have a small space,
small is better. I currently am using 2 large floorstanding castle
speakers, BUT they are too large for the room so I really need
something smaller. I also have my cinema room adjoining with my neigbour, so I am looking for quality rather than something that is loud and has loads of punch.
And the B&Ws look good (in sorento), so 5 of these little babies could do the trick.
The natural thing for me to do would be to go sub-sat. But they lack midrange, and also dispite what people say bass is directional and you can tell that all the base is comming from one place in the room. So I have almost conviced myself to go with normal identical speakers for all 5. (I saw the LCR60 today and it is far too big for my room.)
BTW I used a NAD320i for years and it was quite a nice relaxing budget amp.
So has anybody actually tried listening to music with the 600S3.
Somebody must have!