Your post reminds me that I need to order one for my AR.
I used one my son has on my AR, on which is mounted a Nikon P225 scope in Nikon rings. With the standard handle, it's hard to manipulate barehanded - with gloves, it's near impossible to to do rapidly.
With the Gunfighter charging handle, no pain, no miss. Your mileage may vary, of course, but for the cost I consider it a very nice to have accessory. the only problem was he wanted his back.
Note: I teach in a high school, and I'm way past war-fighting age. I'm not a weekend warrior, and won't be accepting any personal protection contracts from anyone soon. I use my AR as a recreational device, not for dawn patrol on our ranch. I'm not someone that has to have tactical underwear.