I put one in when I installed my Tremec 3550 last year (about 1,000 miles ago). The pedal effort is just as easy as stock and it's got more holding power. It's been great with my new 331 setup. Although, I've only been running drag radials. Next year will be ET Streets so I'll have to wait until then to see how it performs.
Overall, I'm very happy with it.
E