I know! I was completely taken with them when I a member of my local forum suggested them to me during my conversion. I couldn't believe after all the naked conversion threads on here and all the talk of bar end mirrors, that these had never come up.
As for the weight, I haven't weighed them against the stock bar ends (on a scale, anyway), but the hand scale says they pretty darn close to as heavy as the stockers. I definitely don't get any more vibrations than I did with the stock bar ends. Plus, once you add the mirrors to them, it makes up or even exceeds the weight of the stockers, so you're not losing any vibration dampening, IMO.
I love these darn things. Seriously, it's a great idea! :thumbup:
*edit* I should add that they're made of the same material as the stock bar ends. I'm not sure if that's steel or what, but they aren't light weight aluminum. They've got good heft to them, just like the stock ones. And the end has a replaceable delrin slider (the same material frame sliders are made from). There's an allen screw that attaches the slider to the bar end and under that slider is the hex head so you can tighten them down on the bars. They just screw right in like the stock bar ends.