I've had my HUDY system for a few years now, and the only thing inacurate about it is some of the comments coming out of some of the driver's mouths. Of course you will see slop and different measurements! This is due to servos that don't center any more because of one too many crashes and sloppy ball cups. It's not the tool, it's your equipment. That's like going outside and looking at your thermometer and blaming it because the weather is too hot. Is it a pain to set up and use at the track? Well, that depends on how much time you have between races.
Serpent USA doesn't support HUDY products because Xray and HUDY are now supported by R/C America.
Bryan