I cant believe that so many posts, and nobody is looking at RPM axles.... they are the strongest on the market. I have seen all others bend or break regularly. i have only ever seen a few broken RPM axles.
I know most have warranties... but i would sure hate for my race, or riding trip to be ruined by a broken axle. i would rather spend a bit more up front and have an axle that i dont have to worry about again. not to mention on the warranty axles, you still have to pay shipping back and forth... that gets expensive and adds up quick.
Durablues warranty is only good for the FIRST time the axle fails, after that, they charge a prett steep replacment fee.... its been years since i sent one in, but it used to be $150 + shipping both ways.