Holley Sniper EFI

I haven't seen any convincing evidence yet. Some love it and others have continuous problems since they installed it. Others went back to their carb.
According to my local speed shop guy, he has been installing only the FAST systems for customers with no issues

Are you specifically talking about the Fitech or the Sniper or both? I have heard tons of success stories on the Fitech as well as problems that needed worked out. There is a few long threads here on the Fitech, and Facebook has a group dedicated to Fitech support.

I think like most new things, bugs just need worked out.