Just got my first Rotary today. I must say that I'm very pleased. I was expecting something much more hefty given the talk about the robustness. It's much lighter than I thought, though common sense: it's largely aluminum, I shouldn't have expected a dumbbell. Not that it's not robust, but it's not heavy. It's lighter than (at least from memory), the Haiku I used to have.
I've only handled a few quality lights in this size category, and none of them all that similar. I definitely prefer the amazing UI to this than to the Haiku (also amazing, but would have preferred it to be sans memory and instead low-med-high). The size and feel is pretty similar to the Haiku, and (from memory, so is the beam).
It is quite a bit different from the Moddoolar that I "downsized" from that to this. (Had some unexpected expenses). Definitely lighter, and the beams are very dissimilar.
Between all three, I couldn't say which is "better" because (as you all know) they aren't all being designed to meet the exact same goals. That said, I'm super happy, though being not use to no clip, I'm going to be saving to add a holster.
One definite benefit to this over the other lights I've had: it's got a very industrial, not pretty, look to it. In less concerned about the kids running around wildly with it!
All in all, super stoked. Also the first firefly mode light I've had. I've already seen the need for it, but haven't been able to enjoy the benefits.