Late to the party here but I have a decent stash of flashlights and carry one every day.
4 sevens isn't a brand you hear much about anymore, but I have a few that are probably 10 years old and still work well. They didn't seem to keep up with the other brands as far as brightness and features, but if you see a model you like they are pretty good.
I have been through a couple of O-light. The downfall on these for me was the rubber button the side to select brightness. I train horses, help some local farmers and do a lot of welding and equipment repair and that was just a little too rough handling and the side buttons would rip off. I wasn't interested in shipping the lights to china for repair. I went through 2 of the M18 maverick models before deciding to look elsewhere. Really did like the light, but when the side button rips off its very inconvenient. They may have fixed this problem by now.
I tried Nitecore and bought a P12. Very nice light, but the pocket clip was always popping off on me. Still have the light but it is reserved to backup duty at this point.
My current favorite is a Thrunite TN12 (I have the 2016 model). Its a similar size the P12 but the clip is more robust and hasn't ever popped off on me. The side button is metallic and hasn't caused any problems, and I really like the spread of choices for brightness. I usually keep in a medium setting, but if I am out in a bean field at night, its just 2 taps on the button to have over 1000 lumens with a pretty nice throw. It's also one of the cheaper options in this class of light.
Edit to add: I run all of these light on 18650 rechargeable batteries and have a dedicated charger, its much cheaper than running CR123's if you use the light on a regular basis.