My mate bought one, fitted ok, colour not great. He went out for a run and it was gone when he stopped. Works out expensive in the end ! There are a few that keep appearing on here ( Just sold my pearl white one a few days ago )
I have one, Black is not a nice deep black and you can see the slight grey "ish" in bright sunlight, Not too bad though. Had it for 12 months now with no problems with it coming loose, £20 i paid for it.
Only problem with some 3rd party cowls is you don't get the rubber mounts to stop it rattling and paint protector for the back, easily solved with a bit of screen trim and some venture shield
cant find a link bought mine about 1 year ago but the name of the company was jumbo depot. as sps said you don't get any rubbers with it used some draught excluder works fine.