The thing I love most about Convoy lights is how user-serviceable and modular they are. If something breaks a few years down the road, I don't have to worry about sending the light back for warranty--I could simply get upgrade parts and install them myself with minimal soldering. If some nice new emitter like 519A and SFT40 pops up, I don't have to order a new light--just get the new emitters and swap them in, done.
For this reason, I've actually stopped buying lights that are not Convoys, because I like to get something that I can keep indefinitely--other lights tend to become paperweights or shelf queens once it breaks after the warranty period or becomes outdated. I know that people also do find other enthusiast lights user-serviceable like Hanks and Sofirns, but my soldering and general electronics skills are not up to the task.