A little pricey, but when you're on the side of the trail with a broken chain, you could care less.
Agreed with everyone below: these are dead-simple to use and they weigh nothing so why not carry a couple. Worth changing to SRAM chain just for the ease (for XC anyway).
I've got some pretty strong fingers but I had one heck of a time engaging the link until I smartened up. Pop the links in, grab your brake and pedal a couple strokes: the tension from the pedaling engages this little beauty easily.