I know lots of people who've used it or are using it. Some have multiple tunes and can switch back and forth depending on what's in the tank. For many people it's an economic decision. Meth is cheaper than race gas over the long run. They're the ones that blow up. With an aggressive tune it can happen fast. I use it as a margin of safety. I installed it to lower ECT's and IAT's but now use it to vary my AFR's since tuning is such a pain for me. I may invest in multiple tunes in the future.

Les