I had the hotshot for a while, liked its small size, but it was not bright enough, so I replaced it with
this one. It's much brighter. The main complaint about this is it can't be mounted to the rear rack (the manufacturer claims it can, but the tinny short screw is a joke--its length is barely the thickness of my rack mounting tab).
vol, FYI I had a Serfas as well, lost it due to the fabric clip it comes with being the worst design on the planet. The Axiom Pulse 60 from Performance Bike is pretty much exactly the same light and costs less. When I bought my Serfas it was $60, I think the Pulse 60 must have forced them to reduce the price.
The Pulse 60 is often on sale for $30. Since I have a Performance Bike store in town it's def the way to go. Now that Serfas has dropped the price on theirs it's not that much of a no-brainer as when they charged $60+ for the light though.
Axiom Pulse 60 LED Tail Light
BTW I designed a rear rack (reflector) mount for mine and printed it. I'm not really sure if the mount would be identical between the two though, I think they're a little different.
https://youmagine.com/designs/bicycl...0-to-reflector