I remember having the BG treatment once in the fuel system and I think once in the transmission if I remember correctly. I believe that service was on the 2009 LR2. I do remember being surprised by a noticeable improvement. They also back up there products with a warranty.
I worked for a shop and we used BG. Excellent products. Still use them at home today. If you find an Independent shop that specifically uses BG products you get a lifetime warranty. Tranny fluid changes, brakes, power steering, and etc. Took mother-in-laws Villager in for brakes and they gave lifetime warranty on brakes. Offered a trans fluid change with same lifetime warranty. BG stands behind it's products. You will not be unimpressed with a fuel injection cleaning. They can do it cheaper than us buying the equipment and doing it ourselves.