The ranges are the same (or extremely close to) as http://www.metoliusclimbing.com/master_cam.htmlhttp://www.metoliusclimbing.com/power_cam.html
I've had them for 1.5-2 years, but I hardly used them because I have a complete set of the newer power cams. I got them from a guy in the US who had had them for a while, but were unused (i.e. new). I'm guessing from the design they are circa 2004/5 (I'll check for a manufacturing stamps), but they only have wear on them from the times I've used them.