I installed the Bondtech last week on my Ultimaker 2 extended and it is perfection! I also have a Ultimaker 2+ and am actually in the process of ordering a Bondtech for that as well. I only use XT for my prints and have not been able to tune my UM2+ to give me the quality I need: 0,25 nozzle, 0,04 layer height. The Bondtech just worked directly out of the box on my UM2 extended (after the recomended firmaware upgrade).
I measured the feeding of the UM2+ and got strange results since it retracted 1mm more then it fed?!? I extruded 100mm and retracted 100mm and it gave me this strange result constantly. Since my prints depend a lot on retractions and I do not have time too tinker with it now; I ordered a Bondtech. I am sure the fault is on my side, but right now time is money.