My thought on this is that if it did "fix" anything, dealers would be using it for warranty repairs instead of overhauling transmissions with glazed or cooked clutches.
I'm against all additives (seafoam, 44K, techron, etc) so I am a little biased. But, stuff like this does swell up clutches. If there was a transmission slipping issue, and adding this could get someone by for a few weeks to look for a new car/save a few checks for a rebuild/etc, then I'm all for it.
I agree. What does this product do to change the shift? De glaze the clutches? Make the trans fluid slipperier (is that a word?)
Myself I'm VERY wary of trans fluid additives.
Back in the day when rebuilding a trans, we could spot someone who used additives because when the clutches were dis assembled and the seal removed, it was so swelled I used to wonder how it ever fit.
Then again, to get a guy by for a few weeks, a couple of ounces of brake fluid in the trans worked wonders. Swelled the seals, helped the slipping. Wouldn't do that in todays cars.