No one has mentioned the "Graham" technique using Surefire Combat Rings so I will. Before Surefire ever debuted their rings I experimented with that style and once the rings were available it became my default handheld method.
Reloads and manipulations are easier because the light can't be dropped easily but allows you to use your off hand like normal. Splits and accuracy are worse than normal two handed shooting but better than SHO. The light is indexed pretty good with the muzzle. I found that changing the amount of flashlight butt that protrudes from the ring changes your grip and beam index so you need to fiddle with that to tune the light for you.
ETA - I actually run the light "upside down" from how the instructions show with the ring around my middle finger. That naturally makes the light drop outside of my grip when I need to reload or work the slide and indexes better for me.