I am running a Megasquirt II controlling fuel and spark and It seems just fine to me, not to mention I have only $600 into the computer, relay board, and wiring. I could have spent even less if I was to assemble it myself.
Theres a guy, Parish i think, who is running a megasquirt on a chevy pickup with a single turbo lsx motor making over a 1000hp to the wheels. It works great for him.
http://www.ls1tech.com/forums/showth...ght=megasquirt