I tried a pair of Singletracks, which are sort of an all plastic version of the Serfas bar ends. Apart from the cheap plastic threads in the cheap plastic castings stripping out before tightening on the bar, they just weren't quite comfortable. I rotated them so the long ends were up, and they worked better. The only problem was that they were angled inwards instead of outwards, or neutral. The Cane Creek ends look like they could be swapped left for right, and again, be installed upside down. Share your opinions.
Oh, the instructions on the Singletracks said not to tighten more than three turns after contact was made at the split ends. The one that stripped, did so before contact was made.