I would avoid buying a replica one to be honest.. while I've not tried one myself, I've heard the fit is not very good at all. If you want a super aggressive front splitter then get the Regier one, sometimes they look epic.
Votex and ED30 ones are both within £30 of each other new at VW (around £270 new and unpainted), but after a year you can sell either of them for £200, where as the replica one you'd struggle to have someone buy it off you at all.
Plus it will fit perfectly first time..
If you really do insist on buying a replica then ensure it's made out of ABS plastic and check the Ebay feedback of people who have bought that exact item... for example the one linked above was not very well received by the people who bought them.