I like how easy it was to get started with underscore, just include some files in your project directory! The documentation could be more thorough for beginners but once you've got over all those little hurdles this product has been very helpful when working within nodejs projects/projects involving multiple languages (ejmascript / php). It's great being able use these functions outside their intended purposes as well which can sometimes cause problems elsewhere if not used properly enough or at least thought about before using them anywhere else than where they were originally designed - so take into consideration what other applications will need access too after adding one single line import statement :) Great way t o solve many common tasks such us converting arrays from json data structures back & forth between javascript types quickly!