OK, well, more listening today - Mrs. R_S is definitely not convinced. Feels it too tinny and makes the classical music she loves a touch one dimensional. I don't hear that to be honest as I think you can at last hear what the cellos and double basses are doing, but one thing she mention was that you can hear how old it is. I can relate to that alright; it reminds me of my old NAD to some degree (albeit bigger, bulkier and more powerful); full bodied sound, brilliant for (e.g.) certain Jazz, or melodic southern rock - I've played a couple of Little Feat albums on this and they're sublime. New recordings sound okay.
So a big change - I think what the last few months have taught me is that if anything, venture on a change to your hifi with GREAT care! My old Linn Mimik lost its appeal, the SA7001 KI was a step in the right direction, but at a trade off of bottom end substance for midrange and top end presence. A speaker change made some impact, but I'm not convinced on that yet and a new amp also made a change, but again, it's perhaps more sideways than upwardly mobile.
This is all after just a couple of days listening (not even that); I'll want to try it with my 733i's still, but that might be bass overkill. It's a fun hobby and the amp was paid for with plenty to spare having sold a few LPs the other day, but I couldn't take anything heavier to shift round; I'd really do my back in!