I have ran Amsoil in all my vehicles for the last 20 + years... Never an issue. They always exceed the manufacture recommendations. I use the signature series and change my oil once a year (up to 25k miles).
Install was super easy. I have been very satisfied with the unit and I forget it is there most of the time. For the first few days, I played with the settings and finally settled on the best feel for me. No regrets.
I just placed my order for the pedal monster yesterday. Not a fan of the hesitation when pushing the gas pedal... Will report back once I receive it and installed.