I can't comment on the dual illuminated models, but I bought an RM07 (adjustable 6.5 MOA model) in January and it just got back from Trijicon after dying within 1000 rounds on a glock 19. It doesn't seem like my experience is anywhere near common but I have a sample size of one.
In Trijicons defense, they did fix it without any fuss in about 3 weeks time.
The issue I was having was that after a shot, the dot would slowly fade out to nothing over about 2 seconds. Racking the slide or firing another shot would usually bring the dot back. It started doing this after about 750 rounds, and by ~850-900 it was completely gone. Right now I'm operating under the assumption that my experience was a fluke, I've put about 500 rounds through it since I got the RMR back without a hitch.
YMMV.