Depends on the intended purpose but love mine...
Glock 40 and 19: TruGlo TFO tritium/FO
Gary Reeder Custom Blackhawk: FA FO front with Bowen w/o rear
RIA 10mm Combat Commander: FO front with adjustable rear
PARA USA 10mm Long Slide Hunter: FO front with adjustable rear
S&W 686-7 .38 Super: FO front
Ruger GP100: FO front
Find them much faster to pickup for close in self-defense shooting/IDPA competition.
For long range shooting still prefer a good Patridge or Keith Long Range front blade...
Bob
RIA
PARA
GP100