The gas additive debate is a slippery slope. Almost as popular to debate as brands of oil.
Techron is a good product, the first hand experience I have is with the BMW branded product made by Chevron. It's BMW fuel injection cleaner. It contains 3 times the active ingredients contained in a bottle of Chevron Techron, which is of course a higher concentration than using Chevron fuel.
The BMW product sells for 16.00 per 20oz. Bottle and you use 1 ounce per gallon every 6 to 8 tanks. If you have a rough idle or hard start due to partially clogged injectors using it for 2-3 consecutive tanks is good. This works for carb equipped cars or bikes as well to clean out jets and remove junk from your float bowls. The BMW product is also a fuel preservative, an octane booster and cleans oxidation from modern film strip type fuel level sensors. It will not repair a worn or misadjusted carb, fix an injector that is plugged solid or cure male pattern baldness.
I have seen it "magically" fix a rough idle due to impurities in the float bowls on 3 occasions within 5 minutes of adding it to fresh gasoline and letting a bike idle. It does the things the Seafoam product claims to do that I've yet to see happen.
You want to learn about more magic stuff? Ask me about Yamaha carb cleaner concentrate.