My wife refuses to comment, based on the fact that she doesn't want to say anything which might encourage another purchase
She occasionally mentions stutter/judder during pans. But that's because I've trained her well
She was very useful in the early days of my HTPC development when we were trying to lock 71.928.
I happily watched the whole of Ratatouille on PS3 Blu-ray into the Crystalio II before she said that the credits looked juddery - sure enough it was outputting 75Hz (I'd badly programmed CII to change refresh based on PAL/NTSC which is obviously no use with HD).
I guess if I were to take her into a shop and say "which projector has the best colour" she would be able to pick up on it. But no more than me I would guess.