Just purchased it via Microsoft's Home Use Program (HUP). I'm less than impressed. First, the install (and running any app's) can be a bit buggy under El Capitan. Yeah....MicroSloppyCoding knew of the problems before it was released, but chose not to do anything to fix the problems. Outlook still lacks features that Mac Mail has (i.e. ability to resize an image or video before sending).
I wound up uninstalling until MS gets it's poop together and makes the needed fixes. I'm glad I only spent $10 for it vs. $150.