I've got the HKS F-Con V-Pro, I'm very happy with it. as stated it has a fixed tune which I don't see as a problem.
DVS Jez set it up and done an awesome job, I'm only sitting at 204kwaw but still have the stock turbo.
I'll have to wait and see how it goes once I do the high flow turbo upgrade and injector upgrade........
only issue I can really see is the gearbox as it relies on the fuel injector duty cycle and torque curve to know when to shift, and I give my gearbox hell LOL.
as far as support goes I don't see that as a problem because once its setup, it should be fine!!! but then I haven't gone as crazy as Craig or Scotty..........yet HAHA
I'm not trying to crack all these throttle restrictions like Craig and whatever else he's trying to bypass 4wd manual would be cool but hay might as well buy a Audi RS6 estate instead rather than spend millions on hardcore modding the M35!!! probably turn out cheaper anyways ROFL (not really but hay - $225,000)