There is some drift of the centre image when you move your head, but it's much less obvious than before - previous setups have had the centre image sitting on a knife edge so that if you moved your head an inch to the left then the centre would jump to the left and leave the right speaker altogether. Maybe a better way to describe it would be to say the centre image now stretches a little when you move your head to the left, but's pretty smooth and it stays connected to the right speaker, and vice versa.
I've got my classical guitar hanging just to the right of my right speaker and I keep a halved bath sponge between the strings and the body; I do the same with my Taylor acoustic which is hanging on another way. When I say halved bath sponge I mean I cut it in half so that I ended up with two thin but full size bath sponges. It totally works as a string damper when you're playing music. I'll see if I can find a picture...
My setup is completely different so that it's my classical guitar there now and there's a big speaker about a foot away, in the gap between the record player and the guitar (and the record storage unit is on the other side of the room), but you should be able to see what I mean all the same: