Me too, iv read numerous reviews n disscussions on them, but have come to the conclusion that some people like them and see a point,and some people don't see a point,but I suppose it's a personal choice!
As for the re-mapping,iv spoke to a couple of mates,one with a scoob n one with an evo,they both have them without re-mapping and say that some company's will try to make a few quid by telling u to have it re-mapped!!
Tbh I can't really see why it would need to be re-mapped!! Do you?