Its really fast for building front end applications (ReactJs) and is scalable as well which was pretty much its best feature ever!! Also support from sails team has been outstanding till now! Nothing at all!! We are using their NPM package manager too so this helps in creating projects quickly with ease!!Also we can host our application easily if needed without any hassle also. So far everything's good but i would love them more focus on making api calls faster rather than just having a general node js server. As mentioned already one of my favorite features here that I find useful most - Is being able to create new API requests within seconds when dealing with react JS frontend frameworks like ReactJS or Angular Js etc! I like that you can use sails in different ways depending on your needs. You could even run everything locally or deploy to Heroku. The documentation is very well done with examples. It's not too difficult to get started but there are some things which you need to know beforehand (like how to set up NPM dependencies) if you want to have a smooth sailing. I would recommend using this for any node project where you will be handling APIs. We used sails as an API backend for our mobile applications.