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Easily extendable using filters and helpers. Can consume any public API.
Pro Cache templates at the client side
Pro Write once run anywhere
Since Dust's templates are written in JS, there's nothing stopping you from running the same DustJS code both on the client as well as server side (if it supports V8/Rhino JS engine).
Pro Interactive tutorial
Dust.js is quite easy to begin with, thanks to it's powerful interactive tutorial.
Con There are no new releases
And apparently Linkedin will not support it more.
Con Not enough community support
Since the number of people currently using Dust.js is quite insignificant as compared to Mustache js and Handlebars, you're less likely to get your question answered or issue resolved if you start using it.