I had a Trans-go in my old GT and it worked great. I drove the car for 3 years with the kit installed and had no problems. It made the shifts much more aggressive. I could chirp 2nd pretty good when just driving in regular drive. It was also easy to install due to the included video installation. Today, my dad owns and drives the car daily. Its been almost 5 years since I installed the kit and so far no problems. Well worth the $90 IMO.
If you want to really wake up that AOD go with either the Trans-go kit, or if you have the $$, go with a Lentech manual valve body. I would also look into a better converter. I put an Edge 2800rpm lock-up converter in my AOD and it REALLY woke the car up. If money if an issue, then get the shift kit first. Otherwise do them both at once for a night and day difference.
Stay away from Trashgo. Shifting into OD from Drive is not a good option to have. I burned up my new OD in one month at the track. I tried B&M, wasnt enough for me so I went to Trashgo. Trashgo is a no go. Now after enough money wasted, Im just gonna throw in a manual valve body and be happy.