Thanks for the replies, people. I'm liking the new ones.
@eggman65
These aluminium ones can't go straight in to our RE handlebars. I had to saw off the ends of either aluminium end and drill the existing holes in them to encompass the 8mm hex bolts that hold the bar-end weights. Once you get them, you'll understand what I'm talking about. It takes some time to do all that, but it's not hard at all. You'll be happy with the end-result.
Indeed these aluminium ones are quite light as compared to the previous ones. To be honest, I haven't noticed any over-the-top increase in vibration. Maybe I'm just used to this. But as Scott has mentioned, try riding without the bar-ends first. The lightweight of the newer ones will soften out some vibration, and a good thing is that they don't vibrate themselves.