Minecraft Malmo allows AI to operate in Minecraft world

Microsoft purchased Minecraft a couple of years ago and have recently released Malmo
(https://github.com/Microsoft/malmo) which allows an AI to easily operate in the Minecraft world.

"Project Malmö is a platform for Artificial Intelligence experimentation and research built on top of
Minecraft. We aim to inspire a new generation of research into challenging new problems presented
by this unique environment."

It is now quite simple to interact with the Minecraft universe from a desktop PC, and was wondering
if others have used it and what limitations they have come across (apparently Malmo has been used
by researchers for some time).