IMHO, most people don't spend sufficient time afield with one rifle to appreciate the benefit of back-up sights. When I was carrying a rifle in excess of 200 days of the year, my opinion was that iron sights were essential, and I've broken scopes in nasty falls, or when I've inadvertently dropped the rifle. In real life it happens. But the rifle must be chosen with care if iron sights are going to be used effectively, because its uncommon to find a rifle that can be fired with equal ease with both irons and scopes. When I first got my custom Brno 602 in .375 Ultra, it wore the Brno factory stock, and it was a natural for shooting with iron sights. After that stock failed, I put it in a McMillan Express stock, and the shooting characteristics changed significantly. Due to the McMillan's higher comb, the rifle was a bit more intuitive to shoot with the scout scope, but with irons, it rattled the fillings in my teeth, and gave me a headache. It occurred to me that a second optic in QD rings was preferable to shooting with the irons, but I could do it if I had to. My .30/06 Brno ZG-47 has a comb that makes shooting with the NECG ghost ring and post seem very natural, but I almost have to balance the point of my chin on the comb in order to see through the scope, making a repeatable cheek weld challenging, and its certainly not as quick for snap shooting as it should be. Interestingly, today the .375 wears the NECG sights and the '06 a 6X Khales.