I can't really give exact details about the fitment of the other two chaps' bumpers (from this board), but I've heard they had problems of one sort or another too...
Speaking about mine, it's pretty damn poor to be blunt. The opening for the radiator grille is far from perfect, it's currently held in by about a third of its clips, some duck tape and some love/prayers.
It's a similar story in the lower recesses too, with no provision for properly mounting the RS4 mesh pieces. You can bodge them in with sealer and duck tape; the outer two aren't so bad as you can use a couple of screws in them - again it's not perfect though and things aren't in tip-top alignment (but as they say "a blind man on a galloping horse wouldn't spot it")
My biggest problem though is that I have a few gaps here and there. There's a gap under the offside headlight which you can almost get your finger in, the distance between the bonnet and the top edge of the bumper could be a bit smaller, and generally the fitment near the mounting points (ie where it meets the wings) could be tidier too.
Hopefully some (if not all) of it can be put right by building the bumper up a bit to fill the gaps, but obviously that's far from ideal...
I wont even start on delivery time from point of payment or the chaps almost total ignorance of communication - there are 'reasons' (read: excuses) offered for this, but they were quite similar to the ones offered at the time of my first order a couple of years ago (when I bought my skirts and replacement lower valances to the OEM bumpers).
I really don't like to be the angel of death, badmouthing firms, but on the other hand I can't put my hand on heart and recommend the outfit in question as fantastic to deal with or able to supply high-quality, well-fitting product...
Regards,
Rob.