One of HP's reps was on that nightmare thread linked above. He and a couple of shills (or maybe just him masquerading) came on here making wild claims about how much better HP was than UpRev, how many more features it offered, and how it was cheaper. None of those claims has been brought to light as reality, and in fact, the feature set and cost claims were proven to be abjectly false.
At the end of the day, HP is not a bad company, in terms of technology. Some of their employees are questionable, as per the thread linked above, but the tech works. My brother's Chevy Colorado is HP tuned, and it runs like a top. Mind you, that's on the second tune. The first guy who tuned it with HP's software did a poor job, and caused the motor to run rich and the trans to shift funky. After having enough of that, my brother took his truck to a guy who is known to be an expert at tuning those truck's motors and transmissions, and had things fixed. Night and day difference, borne out at the gas pump, on off-road trails, and in stability. And that little inline 5cyl is well over 300k, and about to be replaced due to an oil consumption issue. Trans got replaced at about 290k, if I remember right. Point is, truck runs great and lasted a long time getting used like a truck, with a proper tune. Left with the poor tune, we'd probably have been doing a motor swap several years ago. Which speaks to my point in the prior thread and the one several folks are making here - get a tune from someone who knows these VK56 motors and the Titan platform. I don't have a dog in the fight as I am not tuned nor have I ever been in my Titan, nor do I care who you use, but I have enough experience tuning the old way (with a timing light, a box of jets, and plenty of "garage words" aimed at a Holley carb) to know I don't know enough about these systems right now to take on the job of tuning one.