Full disclosure: I’m a FRPP fan boy.
With that said, the parts are engineered far better than almost all the aftermarket parts you buy. The fit, finish, and quality meet or exceed what you get from the factory.
I’ve had multiple tunes from FRPP (14 Focus St, 15 Mustang GT) both performed flawlessly. Drivability was as good or better than the factory tune, and the power was noticeably better.
As an example, I bought the JLT air/oil separator for my Raptor, but the routing of the lines, and the overall fit was below what I had from FRPP air/oil devices on my other cars. (I was disappointed enough I returned mine.)
The benefit of the FRPP parts is the in house testing, warranty, and excellent customer service.
I actually emailed FRPP when I bought my Raptor and asked if they were going to release a 3.5 eco boost tune. They said no, because the amount of safe HP they could make and still be CARB legal would not be enough to justify the cost.
I’m sure there are plenty of guys running tunes with no issue, but if the company who makes the truck says it’s not safe, I’ll take their word for it.
Just my experience.
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