I like that it's easy to use, as well as having an intuitive interface which makes troubleshooting problems much easier than other similar products in the market place. It can be slow at times when you have more nodes/clusters up (or maybe just one node), but this isn't really noticeable enough to make me dislike using Maas - unless of course there are other issues such as performance or reliability with my cluster! We've been running our own private cloud infrastructure for some time now without any real problem. This has allowed us to run several services from different providers within our network while still being able to control everything ourselves.