It is very easy to integrate with existing code bases (we have many), it has an excellent documentation of what we need at each level from "how do I write this" all way up through how its integrated in our build process etc., which makes customization much easier than other options available out there.- We had some issues integrating one-time passwords into their library but they were quick enough about helping us figure that problem out. If you're looking something different try several before deciding - if your current implementation isn't working well because things are too generic or not specific take advantage of multiple implementations so when someone comes along asking where did ya get those widgets / functions think twice! The best thing about Felgo is that it is very easy to use and understand. We have been using it for our mobile applications and it has been working flawlessly for us. I have not found anything that I dislike about it. I would recommend it to anyone looking for a tool that is easy to use and understand. I have been using it for my mobile applications. It has been working flawlessly for me.