I've been using the BETD conversion since november, my only complaint is the single adjusting tool that was supplied with it, I can't see how you're supposed to tighten the axle using only one tool – this single tool is supposed to be used to tighten the axle in the same way you would use two 5mm allen keys on the standard King axle. Also the King cone adjusting tool wont fit over the BETD axle – although I don't often use it to adjust the bearings anyway. I emailed BETD about this and had no reply, I then rang them and they took my number and promised to ring me back about the problem, but never did. I made my own tool in the end, I've not had any problems with the conversion apart from the fact that only one tool is supplied with it. I was rather dissapointed with their customer service though.