I like that it has all of these features in one place, so you don't have to look around for different tools/libraries if they're not what your looking for or just missing something specific (like an API). It's also easy enough with this toolkit where someone who knows nothing about javascript can pick up very easily without having any problems getting started making apps! There are some things i dislike but thats because its new software being developed by Google - meaning there is room for improvement as well. Just get used to using their IDE which makes developing web applications much easier than other IDEs out here such as eclipse etc., Also use google chrome browser cause sometimes when debugging errors will show up even though everything looks fine, make sure u open developer console first then refresh page again before viewing error message.