I'll keep it. It's quite noticable when it's hit by direct light from the window, but when it's under the desk you wouldn't notice if you didn't know it was there.
If there was stock available, I'd send it back for replacement, but as they aren't going to be available for a while I won't bother.
I have to say that I'm very impressed with the case design / layout; it's just a bit of a pity it's blemished.
OCUK have offered a refund if I send it back within seven working days, but as I said, I won't bother.
Just unlucky I guess
You could always contact the manufacturer, they may send you just a replacement door panel?