Well, they are the cheapest, and when you get the kit you'll see why. Not that they are bad, just nothing fancy and look like something you could cob up on your own. They are completely manual, so the chain only gets oil when you squeeze the bottle. To me, that's a plus over some units, like the Scottoiler, which will dribble oil on the chain whenever the engine is running, so you're lubing a chain that's not moving whenever the bike is stopped with the engine running, such as at stop lights.