These looked interesting, but I've never seen them:
TFO
"Patented, T.F.O. technology combines the brightness of fiber optics with the glowing properties of long-lasting tritium. Provides fast sight acquisition and excellent transition from daylight to darkness with highly visible, green, T.F.O. rods. Machined channels in front and rear sight housings provide maximum, ambient light gathering and protect the rods from damage while concealing them from your target. "
Anyone tried them?