What do you like best?
Microsoft OMS is very powerful (Maybe too powerful). When you first begin, it is a completely blank canvas. That is fine if you are a painter, but not so much if you are hoping to get something showing up in short order.
What do you dislike?
Way too complex! In looking over the application, I found that I felt like I had to go to a couple of college courses before I was going to get anywhere. There are so many products out there that out of the box start showing some value (minimal, but existent).
Recommendations to others considering the product
If you're a Microsoft house and are solely using Azure, you might want to tough it out, take classes, and maybe even drop a little coin on professional services to assist with the deployment. If, however, you are using multiple cloud platforms, I'd suggest you do some digging in to alternative solutions.
What business problems are you solving with the product? What benefits have you realized?
Looking for a tool that provides a broad overview of the current state of operations within our environment.