Any non-Ford tune will void your warranty, technically, no matter who you get it from or how reliable it is.
I work for a Ford dealer and when I called FRPP the way they explained it to me was even the procal is not covered under the "factory" warranty. Ford Racing covers it from the original sell date for 3yr or 36k. But it is not technically a "genuine Ford" product as it was explained to me. So basically saying that if somehow the procal caused a problem for your motor it wouldn't be covered by Ford either (if that makes sense). So when I found that out it kinda of defeated the purpose of getting a procal. I am leaning towards Lund as of right now. I have a factory extended warranty and the procal isn't covered under that, so I might as well go for a more aggressive tune.