RS Direct do a lot of testing of maps on there cars and i can assure you they do not use rubbish... they have there RS500 'optimus' running Revo 425s or atleast it was at one point and they started selling Revo maps! they also do KMS maps which do not require ECU removal and are ment to be very good also so in short you have

KMS
Pumabuild
Collins
Revo
Jamsport


Also dont forget Jamsport have produced some of if not the fast RS in the UK..