I like that it's open source, easy to use, has many different options for data analysis and visualization. It is also very well documented which makes learning how to use it much easier than other tools in this space. The UI could be more intuitive. For example, when you create an environment with multiple notebooks there are tabs at the top of each notebook but they don't link together so if you want to edit one you have to go back into your hub and then navigate down again. Also, sometimes when I try to access my work from another computer or mobile device I get errors about missing dependencies. This happens even though all of the dependencies were installed correctly before I started working on my project (I'm using Python 3). Try out jupyterhub! You will love it once you start using it. We needed something simple to host our code repositories and share them among team members who aren't always connected via VPN.