Its not bad. Seafoam and marvel mystery oil kind of dominate that market, but the Lucas works. Just follow the directions. If you are talking about the additive for your tank, it cant hurt. If you are talking about an induction cleaner, that depends on the type of engine you have.
This cleaner works as a lubricant and gives the injector an extra layer of slip. The extra layer works to keep the injector going smoothly. Lucas also adds a layer of sheen to the injector parts. The sheen is pretty bright too, you can get a peek of it if you apply the cleanser on any surface. Techron is kind of single-purpose.
According to experts like VP Racing Fuels, fuel injector cleaners work as inexpensive preventative maintenance. What you might see, though, are posts and comments on places like .