Before Petzl came out with the caritool, black diamond had Ice clippers, I stitched my first on to my harness in 2002 I think, It freaking rocked! When the ice clipper was no longer available I mourned, but the carrytool showed up and it was all good and I never looked back.
The centre back clip positioning is interesting but a petzl caritool would still be my preferance just a little back from my right hip point for easy reach without straining backwards, with the ms200 its a snap to clip and unclip, I no longer use a lanyard. By clipping into the handlebar its even able to carry an 88 (but its a PITA to do so) a 346 just sits there so nice.