I can tell you that the Hotshot mount is a little bit different than some other lights. It's a great mount to be sure, especially after adding a few washers as spacers on the screw to help it tighten down solidly, but it doesn't work with my other lights.

I have a PB light and also a cheap Zefal light from Wally Mart, both of which can use the same mount. Then I have a Bontrager light which uses a weird sideways clip mount. The Hotshot mount seems similar to the PB and Zefal light mounts, but in reality the Hotshot clip is narrower so it won't work with the other lights' mounts.