I can understand tech support issues and not feeling a brand is standing behind their product, but RC does no more work than Precision. Everybody is taking an OEM injector and modifying it to fit, or flow, to suit.
THe BRMS racecar had an FJO driver box and a set of RC 1600cc. It was touchy at light throttle, poor idle, etc. It has Precision 1000cc's back in it now, and if the car ever needs more than 700 whp the FJO driver box will turn on with VTEC and control some secondaries because those 1600cc's suck at small flow rates. I've been told they are okay with alcohols or E85, and I've also been told that no one buys RC 1600cc for gas applications - everyone runs Bosch - for the same reasons I'm complaining about.
Having dealt with more Precision 880/1000 than any injector, and having dealt with the poor atomization and idling characteristics of 750cc+ RC low-Z injectors, i cannot recommend them to anyone. That being said I love their high-Z 750cc like no other, have gotten some very high mpg lean burn cruise setups working off of them because they do a wonderful job of atomising fuel.