I think all the ffps are illuminated, which helps on lower powers.Which Nitro do you have? At the closeout prices I keep looking at the FFP 2-10 for a hunting rifle and 4-16 for a range/prarie dog AR. The reticles look decent, I'm curious if the 2-10 reticle would even be useable at low power, or if it would just disappear into the background.
I have the 5-20x44 sfp, and the reticle even in a ffp should work as a crosshair at least.