I had Shawn Carlock put one of his on my .223 LTR. I'll be honest, I only did it at first because I liked how they looked but after shooting my little LTR that has one, quite a bit, when I shoot one of my other guns that doesn't have one, It feels kinda weird. It's like I'm looking or grabbing for the bolt handle. I never would have believed that would happen before I had it installed.
Something you definitely want to remember if you have one installed, if you don't already do this, make sure you pull the bolt out before you put it away in your safe. I really like the size and feel of the one Shawn makes because it's not that big but it does stick out a little further than the stock bolt knob and first thing off I put a nice little scratch in one of my other rifles when I was putting it away in my safe.