Claims about lubricants are generally overstated. If anyone wants to take a real look at a comparison of almost every bike lube(and other industrial lubricants) out there, under a controlled test situation, just type in: Dupont Teflon bearing grease for bicycles. This will take you to a site by S and S Machine, toward the end of the site is an independent comparison of just about every type of lubricant on the market, up to and including vegetable oil and WD-40(neither are recommended as lubricants, by the way).
What you will see is the wide difference between claims and performance. I have used two of the recommended lubricants: Dupont Krytox (VERYgood but expensive) and Liquid Wrench Super Lube with PTFE (old formula). The Super Lube w/ptfe was pretty good and cheap, but rather thin,,although I never seemed to experience any under-lubrication symptoms, as I lube my bicycle chain at least weekly, and ride several times a week on flat and hilly paved roads. I have used these lubes for at least four years, and have never broken a chain, nor have any of my chains, on any of my bikes, exhibited significant stretch, to the point that they need replacement, and all have hundreds of miles on them, with some well over a thousand.
The chains I use are Wipperman, nickle-plated nine speed, and I do try to keep them clean and properly lubed. Fellow riders make frequent comments about how bright and shiny my chain and gear train is. I believe good maintenance is a combination of proper cleaning and proper lubrication, and if one factor is neglected, the other can't make up for it. Most riders I know simply take AWFUL care of their equipment, and expect magical results from one chemical or another. By the time they resort to one of these "Magic Bullets!", pretty much anything they put on the chain will make it sound and feel better, but the real damage has already been done to the metal surfaces. Anyway, keep an open mind and you WILL be surprised. Corky.