I actually did wind up buying not only a Focal light, but also a Hangover when the pre-order came available.
I've been through 3 (4?) self-contained lights in the last few years, and not one of them lasted more than an hour on high, let alone die on that actual level of brightness, if they had just one cell; my opinion here: people who were surprised or angry [read: internet outraged] about the light had some wild ideas about what kind of sorcery can happen with a battery. Most of the manufacturers seem locked into a battle of "let's make the light brighter, and use a larger battery to compensate for the lost run time". It isn't necessarily bad, but even an 800 lumen setting on a "flashlight" style beam is more than adequate, so focusing elsewhere would be a nice change from Niterider/Light & Motion (other than gimmicks like color displays...).
For my uses, even the first generation of the Hangover was a successful light. It had [has] adequate throw in all modes, didn't waste a ton of light making sure the bats could see, was light/low-profile, and supported quick charging/pass through. You could throw a $5 battery bank into your pocket, and hook it up using the included charging cable, easily extending the run time 1-2 hours more.
The current (second) generation of the light fixes the largest, and in my mind, only real issues with the light: the wailing noise that the step-down circuitry made during use, and the user interface. The second bears some further explanation; in the original light, even if you locked it into a mode (high, medium, low, etc), it would hold steady for a bit, and begin to drop until it reached the next lower mode [so, just like every other torch on the market]. At that point, regardless of how much charge the battery actually had left, you couldn't put the light back into high, for instance, unless you turned it off completely first. For my purposes, this wasn't a huge issue, but it was a bit irritating. The newer generation now lets you select whatever mode, regardless of how much charge the battery has (ie, with only 10% remaining, you could flip the light into high, even though it would deplete the battery in minutes).
The light really shines (no pun intended) when paired up with the larger Focal light--their wider/nearer field is complimented quite nicely by the punchier nature of the Hangover, and the tints match, naturally.