First of all - it is easy to work with, it's intuitive, it uses tooltips in the backend, so you easily get an idea how something works, without you have to look it up in the documentation. And the documentation itself is really well done. The team behind must have spend a lot of hours on it. On top of this, the developer answers questions really fast and he is right down to the point.
If you are looking for a maps component for your site - well, here it is!