Who makes them? Which is the best? I want to run a 250 progressive and trying to learn more about these.

 

i have a tnt f-2 with a f.r.e.d. controller (copy of nx digital max), i love it, you can control the hit on the tires easily.

havent hit mine with more than a 100 yet, but on the 100 starting at 65 percent power, it pulled a 1.58 on a set of 26x10.5x16 et streets in full street trim. on a 75 shot on the street, i could hit it where it wouldnt fry the gsc's even.

expensive, but worth the cash.