I only gave 4 stars because of the lifespan issue of the Orange sites. Read on for details:
I bought the Green front and Orange rear sites. They work great, however I was disappointed by something I learned AFTER installing them and reading the details of the documentation that came with the sites: The Orange sites only have a 5 year expected lifespan. The Greens have a 12 year expected lifespan.
This means I have to replace them again in 5 years! I really wish the product description would have mentioned that important information because it would have influenced my decision to go with the Yellow sites (which have a 12 year lifespan).