Its true Shimano roller brakes aren't serviceable, but if greased as required a few times a year they will last many years. I upgraded my gazelles brakes to the top of the line Shimano roller brakes and they didn't cost much more than a couple sets of koolstop brake pads. If I get 5 years out of the roller brakes I'm way ahead of the game as I can go through 4 sets of pads and a rim in one year with the wet environment here in the PNW. The price of this is higher effort at the lever