Quick question: With ES6/ES2015 based native promises on the way (see https://babeljs.io/docs/learn-es2015/ ), why would you still want to use something relatively proprietary like Bluebird?
Bluebird provides a lot of really useful methods and abstractions over promises that we use on a daily basis. Basically all the methods I point out in the article are not part of the Promise spec (and probably won't be). The other thing that Bluebird helps a lot with is providing functionality around transitioning from non-promise code to promises by providing methods such as `promisify`, `promisifyAll`, `fromCallback`, and `asCallback`.
http://programmers.stackexchange.com/questions/278778/why-ar...
1) Bluebird is orders of magnitude faster and more memory-efficient than the current V8 native promises. Better native promises performance has been promised, but we are still waiting for it.
2) Bluebird is just as much standard-compliant as are the native promises.
3) Bluebird has very useful extensions, which are not (yet?) part of the standard. You are not forced to use them, but they are still very nice to have.