Its a low sample size not "no history of success". Every single PE1420 dyno put out has had great HP. In fact each one dynod has seen higher and higher rwhp. The last 2 consecutive have been 500+ rwhp on PUMP gas. That is a history of success in my book. Maybe you can point out some other turbos running that kind of HP on pump gas? I actually cant remember seeing any.
Play of words I know but seriously, saying "they have no history of success" to me implies their performance so far hasnt been any good which I think is untrue and misleading.