I’ve been really impressed by Dart as a programming language. I’ll admit I don’t have a breadth of knowledge, but coming from C# I feel right at home, and it has a few extra neat tricks that C# is picking up in return (like empty list syntax and the spread operator).
I run a “public” instance with basic auth so I can use it from anywhere (phone, work). I’ve made my instance my default search engine everywhere. (I know basic auth is not the most secure but I wouldn’t even really care it other people used my instance; I just don’t want it hammered.)