What is more important is what brand is the spoiler? It's not like Stage 3 or any of the big parts houses carry inventory on that stuff, it will be drop shipped right from the manufacturer with no warrany anway.
I ordered my Roush bumper from them. I would say my experience was average, nothing stood out but nothing bad to say either. They shipped it fedex and it got to Texas in 2 days from Arizona. The body guy wasn't thrilled with the quality and it had a few rough edges, but all in all it was better quality than most body parts I would guess. I kinda question if it is a true Roush/Saleen piece but its close to it.
If it is a REAL saleen you may in fact want to stay away. They can be really rough. Another company I'm not to keen on, who is a manufacturer carried by many part houses, is AIT. They lay their product up waaaay to thin
I have read many many threads about the appalling quality of Saleen body parts. Nightmare stories about the about of prep they needed. I woulod never buy a genuine Saleen part. I'd prefer a knock-off version.