I actually imported and sold this when I'd just started my garage. Seafoam is nice, but there are more effective ways and more effective chemicals. It is designed to be delivered to the engine in 3 different ways, as far as I know, no other off the shelf product can/should be used thus.
I've used the SeaFoam 3 step treatment (1/3 in engine 1/3 in gas tank 1/3 in intake) and also the Hydra Trans Tune. My personal experience was that it works great or at least seems to work great for the first couple of days...then its back to business as usual. Could also be a placebo effect or coincidence.