We've dyno'd cars that the previous tune was with Trent, and they are a HUGE difference in readings. Donello Performance has dyno'd cars after Trent has tuned them and still, 50-100kw difference I shit you not. I know of a 33 GTR that's currently about to have an engine rebuild, supposedly made 500kw on Trents dyno even though the turbo's he had on it are not known for producing that power, and guess what, dyno'd and made no where near that, couldn't even crack 400rwkw.
Add to the fact that today I just removed an engine from a GTR that had been tuned by us, then he decided he wanted more power, went to Trents, got more power, then it pinged and put a hole through the piston the next time he went to the track. I wish I could say that he's a good tuner, but even driving the cars in and out with his tune, lmao trying to start them in the morning... don't even get me started on his E85 Cold Start tunes.
The only people rant on about Trent is because he gets big power figures, so forum warriors can fap over it and brag and omg its so fast hes actually the best... yet they've never really had it tuned elsewhere to know what they're talking about.
Also just FYI, the average tune costs $5-600 iirc, I don't think Trent is doing them any cheaper than that, but I guess the saying rings true, you get what you pay for.