I use it all the time. And I'm always looking for sales and coupons for the stuff. But my thinking with most of these fuel system cleaners / additives, is they will all work, but you have to use them A LOT. Don't expect anything miraculous to happen with one can. In my truck I use 2 cans per tank. That's 4 cans per fill up. I do this after about every 4 or 5 fill ups. But my truck idles like a purring kitten, and passes emissions with flying colors. Even the guys at the DMV testing station told me they never had a 27 year old vehicle pass with such low overall numbers. They were all looking at the printout after it came off the rollers.
Everything on the fuel system is original, except for the gas caps and fuel filters. Back when I had my 1991 Mustang it failed, and ended up costing me over $650.00 to repair, and get it through emissions testing successfully. The place that fixed it turned me on to the Gumout Multi-System Tune Up, and I've been using it religiously ever since. In everything I drive, or that has a gasoline engine. Including my generator and pressure washer. $650.00 buys a lot of additive.