Brian Turner, the owner of Dynotune Motorsports and our dyno tuner at INTENSE Racing (where I work), Said those auto tuners are no where near as good as a good dyno tune. He said the AFR wont stay stable even when there are no changes made between runs. He does go on to say though, they are better than no tuner at all, and they're better than most (if not all) of the preloaded maps available.