1) They're WAY too expensive
2) They're the ugliest thing I've ever seen
3) They add wieght to your car with no benifits
4) They're not "custom". If you called them and gave them your own design to build for you, then they'd be custom. I won't deal with a company that thinks I'm stupid.
5) Ugly again.
6) These are almost as bad as those fake turbo air cleaner deals.
If you like 'em, that's all that matters. But you asked for opinions.