I just got the Serfas in last night and did a quick video. I posted it here:
http://johnridley.blogspot.com/2013/...ther-test.html
In short, if the Cygolite Hotshot is using the same LED as the Serfas, they aren't taking full advantage of it. The Serfas is pretty amazing given its size, and they do manage to keep the runtime pretty reasonable. You're just not going to get 30+ hours out of a small light that bright but 3 to 10 depending on mode is pretty good.
I think it's cool that we have as much choice as we do. All the lights on that pole are OK, even the SuperFlash, even though it's badly outgunned, and all $60 and down, most < $40.