I was disappointed. Within two years of minimal use (<40 times) and despite taking care of it (rinsing after each use, storing in the shade), the silicone(?) started to deteriorate and stick to the touch. The visibility was not very clear and the lens had peeled off from the coatings inside within a few weeks of purchase - but it might have been my fault for that (I once put it together with the keys and they scratched it, causing it to peel off)