>>2057254They are great. Never go out of adjustment. Can change gear stationary. Chain never wears out as isn't derailing all the time. Just Works.
I have a pair of paddles at the end of the drop handlebar now. The friction shifter it replaced was useless and missed lots of gears but the paddles designed for the gearbox also Just Work.
I would never go back to cogs. Only change I would make is the 11-speed one I got is unnecessary. I am always changing gear two or four gears at a time (i.e. one or two big pushes instead of a small push for one gear). Five gears would have been fine. Only thing that counts is a low enough bottom gear which is anyway defined by the front and back cog sizes not the gearbox. Top gear is very nicely positioned as a fast cruise with the wind behind me on the ratios I have it set up as.
Chain is always perfectly tense. Not needed any maintenance in two years use. Works best when freewheeling to change gear although it will work if you are pedalling, just less certain.
Very easy to get used to. Also very easy to get used to it not wearing out in a few months nor constantly having to make little adjustments to get into highest or lowest as it works perfectly all the time.