I had mine installed when i bought the truck new. Paid around 2500€ for it. My truck has 85000 km on it and it works perfect. When they just installed it, it stalled sometimes at wot, but the installer took care of it and works with no problems.
@Fb73, what brand is your system and do you still have the 80% of max capacity safety in your tank?
Yes you can only fill up to 80% of max capacity, then the pumps here automatically stop...But a friend told me you have to careful when going to spain for example, there are some pumps over there where you could fill your tank up to 95%, but then it would block the whole system in security, depends of the pump I guess...
My install was more expensive, paid 4000€ for the latest Prins VSI system, double pressure relief valve to feed the beast, electronic flashlube (Valve saver oiling system)...never had a single issue, depends a lot of the tech who's doing the install I think...
Why are you getting interested in that @Yukon Joe ? I don't see many people interested by this technology in the US, gas remains cheap in your country (?)