i personally have a Geisselle SDE that I bought from MidwayUSA when it was also on sale a few months ago. Its worth every penny. No creep, no grittyness, and it breaks very cleanly and predictable. IMHO, I find that the trigger pull is perfect for a 2 stage. Its not super light, and its not heavy either. When I pull the trigger quickly for quick consecutive shots, I don't consciously even notice the 2 stage break. If I squeeze it slowly, the 2nd stage "wall" is well defined. The SDE has a flat trigger face. I'm not sure if I recommend it, I feel that is more about personal preference. The flat face doesn't negatively affect the performance of the trigger, but it does take some time to get use to. As for reliability, I haven't shot enough to comment on the reliability.
If I were to make only one upgrade to my rifle and be done with it, I'd buy a geisselle trigger.