Okay, I've been lurking for a while but this is my first post, so take it for whatever it's worth.
I have all three of the lights in question. In order of brightness, lowest to highest, it's X1, RR, LifeGear.
I haven't tested runtimes, but I did have the Inova shut off suddenly one night when the batteries couldn't produce enough juice to maintain the correct level of brightness anymore. I took that battery and put it in the Life+Gear and it continued to work in that light. Don't remember how long I left that battery in that light.
The Life+Gear has great throw IMO, the RR is decent and the X1 is mostly flood.
The Life+Gear (once I tightened the bezel properly) and X1 have proven to be very waterproof (when they get dirty I wash them under the faucet) while the RR got some moisture under the window/lens last night during its first bath. Light continues to work and the moisture dried up eventually. Gotta get this thing apart, but I've already read in another thread that that sucker's expoxied on.
I've had the X1 for about a month, the Life+Gear's coming up on a month and just got the RR yesterday. They each serve a different purpose, with the X1 being great at not ruining my night vision while providing a little extra light. The RR's fairly bright without being *too* bright, again, at night. The Life+Gear is visibly brighter than the RR, though not as bright as my no-name Chinese three-mode light.
I can't vouch for durability because I haven't abused these lights much. The anodizing on the Inova is definitely better than the Life+Gear, though, which is showing some scratches from being shoved in a back pocket with a pruning knife.
I haven't had any problems with the Inova so far, and in fact replaced the contact plate in the tail cap with a ground-down penny. It definitely makes the switch feel more solid. This I learned from a youtube video uploaded by someone who I'm pretty sure is a member here.
Now I've just gotta get the RR properly waterproofed...
Update: Having just done a ceiling bounce with the RR and the X1, I'm gonna have to give the edge to the Inova, go figure. It seemed to light up the area better and light up a larger area. So maybe I should have said "order of perceived brightness". The RR still throws farther. Or seems to, anyway.