I feel that as you have come from a pair of older Kef's you should certainly be hearing some parts of them that should be exciting especially since you have a woofer working on the bottom end
Have you changed the quality of the music from MP3?
Yeah well the bass deffo sounds tighter with the sealed unit, I like it, esp in this room.
However there's such a small amount of it, without the (also sealed) sub I'd have been quite underwhelmed.
Kef did suggest q750 to be honest when I asked what to replace q55, but I thought they'd still kick out some bass of the higher tones (like 70hz - 200hz) pretty loudly, and then my sub could handle everything else nicely.
I THINK they're a little clearer, but as said I'm really indecisive mentally. I have no idea to test.
I've just been listening though a tracklist and making notes on the tracks in iTunes (eg if I hear something distorted, not right, or something new in the tracks ☺).