Depends on your eyes and what/where/when you hunt. My young eyes didn't need sights under old spike rules, but old eyes and new antler restriction make it necessary to see brow tines. I stuck with sights on my 7600 35 Whelen because bear don't have brow tines. Last half hour of the day in heavy cover the only thing I could truly see was the glow of the sights. Best brush gun is one that misses the brush. Low power light gathering scope is going on the Whelen soon.
A gun is like a parachute... when you need one you usually need it pretty bad...