I have DSS...
bought them when the stock axles were not available and needed an axle - so far, no issues, but I also switched to solid mm's and I have poly lca bushings - prior to installing both, I had wheel hop and I'm convinced that was what did in my stock axles. I plan on going to stage 3 HP, so we will see. I know I've seen posts where (recently) DSS has been given good reviews. There were definitely some issues in the past. I'd like to know when the poster that had 2 bad DSS axles purchased his, so we can get a bit more info. DSS is the only company that makes SRT-4 axles that are made with components that should be stronger than stock (tripods, etc.) - as with any fwd, wheel hop can kill anything, even DSS.
cost (per axle) is roughly double+ vs. stock cost -
$700 for DSS = $350 per axle vs. ~$150 per axle
It's hard for me to judge what the expectations are for the folks that buy DSS...they are not invincible, so they may feel let down if they break. Not sure. Mine are fine, but I'm stock HP (with a few mods), drive sanely for the most part, and wanted an additional margin on the axles (I HATE doing things twice and I've replaced stockers twice)