OK, my mount just came in, and I thought I'd share my experiences...
REALLY light weight. Lighter than the little 1" scope ring I was using.
Although the mount is plastic, I tried to break the ring by squeezing it, flex it in some way, and literally tried to tear up my new mount in my hands. I couldn't. I'm sure I could run over it and break it, or MAYBE stomp it into submission, but with a flashlight in it, I doubt it would break then.
The ring for the flashlight is a single solid piece, and the flashlight is secured with 3 SET screws. At first I was not happy with this, until I put my Laser Products "Operator" weapon light in it. It just turns out that the three set screws line up PERFECTLY with the very deep grooves machined into these flashlights. Even before the light was tight, the set screws in the grooves wouldn't allow it to move forward or backward while I turned it to get the switch in the right position. I have a 100% no-slip mount for sure.
On to the mounting screws. Also by blind chance, I pulled a screw from one of my Yankee Hill 1/2" risers... Exact same threads, and EXACT same length! What this means is that I should be able to purchase two of the thumb screws from YHM and make this mount a "tool-free" installation. Not as "QD" as Forest's very nice TDI products, but all I need considering I like the side mounting of this mount.
THE BAD...
The only thing I found that wasn't 100% about this mount is this... It mounts SO close to the rail, that on my Daniel Defense rail with XT panels, it's a little TOO close. The mount starts at an angle and is pulled into place when tightening the screws, and the flashlight itself pushes into the XT panel a bit. No big deal, but not 100% either. If I were using KAC or TD panels, it may not fit at all since they're plastic and can't be squished. I'm sure if I used the top or bottom rail, rather than the slimmer side rails of the DD, it wouldn't do this. I probably also wouldn't do this with any other brand, BUT the slimmer side profile is what I like about my DD.
Overall, I like this mount for the price. I will be e-mailing BrightFlashlights about a couple of thumb screws, and worst case scenario, I'll move this thing over to my Beretta Storm and try again. But I think it's a keeper.
Thanks again for the heads-up URFUBAR!