Own a Honda ST1300 motorcylce and put in AMSOIL this summer and was amazed at the improvment in the smoothness of the shift. Really had no idea oil could make that dramatic of a difference.
My 2000 Tundra with 61,000 has shifted rough since I bought it two years ago. So I bit the bullet and put in AMSOIL ATF fluid and I have to say I am having the same experiecne. My Tundra shifts so much better. Needless to say, I am completly sold on this product. It's not cheap, but for me, it is absolutley worth it.