The twin ring sprocket wears far better than the aluminum sprockets from Rental. It is significantly heavier than the aluminum sprockets but obviously not as heavy as the full steel versions. My little thumper eats through light sprockets so I am pleased with the minimal wear I've seen so far.
Aestheticly, I would like some color choices, but the brushed aluminum and matte steel look aren't too bad. It looks nice with a DID ERT2 gold chain, but every sprocket does.