Fenix makes good lights. I can only think of one or two that have come back with problems out of literally hundreds we sell a year (probably closer to 4 digits than 3). The LD10 is a very good light. That said, a few things....First, at least 90% of the lights we get back that failed are AA based lights that have had batteries leak inside them. Alkaline batteries have a tendency to do that inside lights, and I am not aware of any manufacturer who will cover that under warranty. Second, a AA battery is 1.5 volts. A 123 is 3.0 volts in Lithium form. They don't leak. So you essentially (yes, this is simplistic and there are a significant number of factors that effect this) have a battery offering double the power without the leakage issues, with a 10 year shelf life. The biggest argument against 123's is that sourced locally, they can be very expensive. I've seen them as much as $16 for 2. But we sell them for $1.99 (+/- based on quantity or brand), and keeping the 10 year shelf life in mind, you can buy a dozen, and cost becomes a non issue because you will use AA's on roughly a 2-1 or more ratio, and you aren't paying the incredibly high local prices for 123's.
So I'd recommend a light that uses a 123 over a light that uses a AA battery. If you want to stay in the Chinese made lights, I'd look at 4Sevens first...quality at least that of Fenix, with a 10 year warranty compared to Fenix's 1 year warranty. I would spend a few extra dollars, and go with a HDS Systems Clicky 120. It is "only" 120 lumens, but keep in mind that "US lumens" are always going to be lower than "Chinese lumens". There are a bunch of reasons why, the biggest of which is that Chinese manufacturers normally measure output at the emitter where US manufacturers measure output at a distance in front of/away from the light. I can say that I have personally compared the HDS 120 side by side with Chinese lights in the 180-200 lumen range, and it is every bit as bright. But, you get a US made light with a lifetime warranty. You get a light that's built like a tank....Surefire is the Gold Standard of the industry. They make fantastic lights. If Surefire is the way a light is supposed to be built, HDS lights are exponentially overbuilt. They are slightly more expensive than the Fenix, but are worth every single penny, and can be had at right around $99. I don't know how to offer a stronger recommendation than to say I can pull whatever I want off the shelf and stick it in my pocket for free. I bought a HDS Systems Tactical Clicky 170 (their "flagship" until the 200 came out this year) out of pocket, so I never have to give it back.