The LG1 pretty much set the benchmark for modern DH chain devices when it was launched back in 2009. The latest incarnation, the LG1R, is e*thirteen’s bells-and-whistles lightweight model, designed for the modern crop of svelte World Cup machinery. The only real difference over the standard LG1 is the carbon backplate. This saves 18g over its alloy counterpart and accounts for the £50 increase in price.
This really is as posh as chain devices get and would be the icing on the cake of any ultra-light downhill build.