Vitandus: did you happen to read Brooko's post on the screen removal? Anyway, he tested the FH5 with and without screens and there was no viable difference. Check out his post.
I did, and I've seen the arguments back and forth from others. For me, it was a QC issue rather than sound. I would rather have the screens there and opt to remove (or keep them) than not.
In any case, I returned them and am thinking of going another route. Maybe other tips would have helped the comfort, but they hurt my left ear quite a bit.