I have not done as many as Andy but I have done 2 of them so far and both installs went real nice. There is a Facebook group for them and the biggest problem I have seen is not taking the time to do a clean install. Make sure you ignition setup is good. I did a Caddy 500 and a SBC and did timing control on both of them. The Caddy was a little bit of a pain because they do not make the HyperSpark for it. Any questions, just ask.