I was going thru this few months back, and I decided on the RT900 for price. It is a good sight. Everything is metal except the fiber. So I think it will withstand some abuse. Just carry extra fibers or rig a protection. If you're using light for the fibers, you don't need to change them. If not, I suggest replacing those fibers with Fitz. They're awesome in low light. The only thing this sight needs is micro adjustment.