They are actually very nice to map. Many many more features than pfc e-manage etc.. but - and this is a big but, they wont be a particularly straight fit on the GTI-R since you will need to fit new CAS sensors etc. This may not be too bad if you dont mind doing this, but its the only down side of getting an European system on a Jap car.
I heard back from a guy today with a Micra today (1.4 16v) which has a forged engine and pistons rods etc that I put together for him (running omex). On its first r/r which imo I wouldn't have said it was ready for, it pulled 208lb ft @ 4000 rpm and 201.7bhp @ 5600 rpm. Its very strangled by its stock cams at the moment..