no problems with mine, and a big increase in power and modulation over my previous Juicy 7s
nearly 3 years old, been all over the globe doing big descents and no problems with power / fading
if bled properly (many cannot do this – its not their fault, Avid Elixir CRs are tricky to bleed compared to the cheaper Juicy, Elixir R or Elixir 5) you won’t have issues, and despite popular opinion they don’t need regular rebleeding (this is only caused by bad bleeding)
last week I rebuilt my rear brake with new pistons / seals as the back brake had gotten a little noisy and tended to drag – the pistons were worn
after a rebuild with DOT rebuild grease (high temp silicon) and a bleed with DOT 5.1 and some new pads, the brake feels silky smooth and works great
today, I did a brake-dragging descent of the “wrong side” of Ivinghoe beacon and my brakes were smoking at the bottom, but kept the bike under control with no fading, and this is only using 160mm rear and 185mm front
from time to time, I have had problem Elixirs through my workshop, but this happens with any mass produced product being made in 1000s of units 😉