Its a relay cool system! It is definatly for someone who has the time, and mechanical aptitude to tune, but gives you the most control and versatily of preaty much all the systems out there. As for mine I built the ms2 v3 system and have programed it to run 16 injectors 8 all the time spraying on the valve (for emitions and milage) and 8 down the throught of the runners that turn on at 3000 rpm+ and high load (for power). I just last night welded my intake together and just need to weld the second set of bungs in and some finnishing touches. So I have not run it yeat, but programed it off of calculations and tested it on the kitchen table with a drill to verify it all works. Then you bring the price into effect I will have a 700 hp efi system for a hp 440 all said and done for about 1000$ cdn the megasquirt it self was 189$