I have the 1/4" Meta peep on my Pearson Stealth. I have Vapor Trail strings on that bow and my peep comes around perfectly every time. It hasn't moved in one year.

I don't know what it weighs, but I don't think there is a lighter peep out there. I like how it's angled so that at full draw you are looking through a perfect circle. It's the best peep out there IMO.