I have not yet experienced it personally, but from what I have read the 11-speed requires considerably more pull to set the link than the other speeds. I would be inclined to buy the installer tool just so I could have my hand and my eye right on the link as I am setting it. At $5 a pop,I want to make very sure that it is aligned just so before I applied pressure to expand the chain and set it. If I set it up so it looks right and then move away from it in order to hold the handlebars and step down on a pedal, I would be concerned that perhaps it would slip out of proper alignment. I know I have to hold the 2 sides of the 10-speed links together just right for it to set properly and think this one might be even more picky.