Brock Stewartwrote a review of Shimano XT/Ultegra CN-HG701 11-Speed Chain on September 17, 2016
Familiarity: I've put it through the wringer
I use this on my 11 speed Ultegra and 11 speed XT. Been happy with it on both bikes. I have broken a chain on my Ultegra, but I mostly attribute that to misalignment on the rear derailleur on a high pressure ride. I don't think any chain would have handled that.