Revo - They currently have a 20% discount offer on at the moment too. There's a few REVO dealers near to you too.
Doc - All the feedback I've read about the maps have been good.
APR - Now back in the UK, but last time they threw their teddy out of the cot and left APR tuned guys with no support other than the dealers having to swap to other Mapping companies and offer reductions to change. Seem to be back on form at the moment though
Superchips - I've heard mixed reports, some love them, some hate them, but most have had to go back at least once to have their maps altered/tweaked for various issues like having the wrong map on or not having a certain part of the map active or DSG version instead of manual version. Doesn't give me confidence.
Several others knocking about too AMD, MTM, Viezu etc
