I used one on a job last fall. It was cool, but it seemed that if you didn't have the stapler sitting perfectly straight and flush on the surface, it would misfire and jam. Hard to get into tight spaces.
Thanks for the info. I picked up the Powerfast the other day to try. BTW, I took a service call today for a relative who lost their CCTV security picture some time ago. I found that someone had put about a dozen staples THROUGH the audio/visual cable, between the camera and the monitor, oops!