I just used the TanPan myself on my change from a 10sp. 105 to a 1 x 11 w/ Force CX1 crank, 40T ring and Shimano XT derailer w/ XT 11-40 cassette.

So far so good. You pretty much only get one shot with the shifter cable with the tanpan. I messed it up once and it shreds it, so you need a new cable. Once in right it all works super smooth. Here's mine: