I have tried many sights from different manufacturers and for a night sight set for a Glock the Pro Operators are by far my favorite. The rear jewels are very un-invasive during day use and among the brightest at night. I prefer black contrast sights for day use. I find equal height, equal light easier to establish without the distraction of dots that may or not deliver equal height as compared to the physical front and rear sight body.
All of my best target pistols like the Sig Sauer X5-L1 or CZ TS come stock with contrast sights. Gun manufactures know what works best for accuracy with their target guns; contrast sights great for day use; not good for night use. I like these Pro Operators as they are best compromise between contrast and night sights.
Pros: reasonable cost, great day use with really outstanding night use too
Cons: none
This review was written in the old system and had content requirements that are different than reviews written today.