I have short fingers, so this thimble doesn't fit properly. It keeps slipping around my finger because it's tapered and it's too big on one end to fit snuggly. Not only that, the yarn keeps coming out of the loops. It might work for someone who has long fingers but for me it was a waste of money.
This is a very sturdy piece of equipment (unlike the clover yarn guides, which I used to love), and I've put one in each of my sock knitting bags. I expect it to last for years, and being a "Continental" knitter, it's wonderful for all kinds of stranded work. It even looks nice worn on the pinky at knitting guild meetings!
I know this is designed to be used with the Continental knitting method, where the yarn is held in the left hand, but I use it with the English/US method, just to speed up my knitting and control the tension. Works great! No more dropping the yarn and stopping to pick it up... I have several of these so I always have one available to use, no matter how many projects are "in the works." Only problem is finding it - only one JoAnn's store I've been to personally (out of 5) even carries it in the store, so online is a good source.