There are so many inexpensive 18650 light offers on Ebay, dx.com and AliExpress, that chances of someone trying out any particular one are very low. However, I tried several and beam and other qualities were really bad. I had hard time figuring out how to use them - certainly not for riding. I ended up getting Rofis for regular use. I also tried Fenix and Nitecore, which were reasonable, but I resold them as Rofis was more versatile. There was also some Korean midprice brand that was reasonable. The inexpensive ones are in practice useless and cannot be resold.

Correction: The intermediately priced brand that was of reasonable quality was actually the Chinese WOWTAC, there on Amazon and elsewhere.