I had a 2.5X Ultralight with heavy duplex on my .416 Rigby for about 1000 shots and then 2 back to back safaris. The theory seemed solid, huge and forgiveing eye-relief, bullet proof reputation and it even looked right on a express style rifle. With careful target selection, time on the range on nice days never gave any indication of trouble.
The wheels fell off the wagon when the hunting started. Shots at any distance had me wishing I had anything else mounted. When hunting thick bush I didn't realize just how much a higher powered scope aided in seeing the obstacles like trees and branches. Then theres those little matters of finding holes to shoot through, figuring out which of those big black blobs was a bull I wanted, and how it was positioned. When I did meet my buffalo in a shootable position it got worse. It was early in the morning and the jesse was thick and dark. We got in front a herd and as they moved toward and past us, I couldn't see my stupid crosshairs. As luck would have it, we gained enough light before we ran out of buffalo. When I took my shot at about 25 yards the herd was on 3 sides of us, and it got a little lively for awhile.

I doubt there was a shot taken on game where I didn't wish there was a different scope on the rifle.
I took that scope off the second I got home and replaced it with a 1.75-6 VX111. End of problem. I used that one elephant hunting without any equipment angst. Plains game were no problem either.
Since then practically every shot that I've ever sent toward a buffalo has been aimed by a 3-9 Zeiss Diavari, or a 2.5-8X Leupold VX3 on my .375 and .458. It is unclear to me what great feats I was supposed to be able to accomplish with a fixed 2.5 or 3X that couldn't be pulled off with a variable set at the same power. These scopes mount in the lowest rings too.
The lone exceptions were shots taken with an iron sighted .450 NE double rifle. That was just for fun.