The Zex kit isn't bad, they just rate their shot at the flywheel like NOS. They just use smaller size jets for their 100 shots versus the size of NX's jets for 100 shots.
I have an NX wet kit spraying a 100 shot and have almost 70,000 miles on my car. I don't use a drop of oil between 5,000 mile changes.
Get a tranny cooler though, its a must. Heat kills these autos, keep them cool and they will run for a long time.