I've had my LD10 for close to 3 years now. It is amazing, worth the price and I've used it nearly every day for more than just a few minutes (engineering work around telescopes during the day in a dark enclosure and at night requires light).

It is starting to get to the point where it is finicky with the batteries I use in it. Sometimes it doesn't turn on and it takes multiple clicks. I don't know if it is the switch that needs replacing (it comes with a replacement rubber switch) or if the circuit is truly dying. Either way, I plan to replace it with either another LD10 or something with more lumens, although I love the LD10 because it uses AA batteries and I am supplied with AA batteries at work for flashlights.