Microsoft is trying to give the other “on-Demand” Business Intelligence vendors a run for their money. The enterprise folks didn’t give Power-BI a second glance when they leanered the only way to publish was to the cloud. Cloud = Bad. There was talk of SSRS being able to be the portal for all things Power-BI and now some if this has come true.
Microsoft has an Azure appliance that you can “play with” while Microsoft tunes things up. I think this is going to be a look-see for me in the near future. I will post what I find.
Tableau is one of the better Business Intelligence tools in the latest NEW BI tools being released that I call BI-Fresh. It works with many different data sources including some of the larger cloud based databases. While my experience is limited to Teradata data warehouse with Tableau I would recommend it for your short list for BI-Fresh evaluations. Here is a recent review done by ComputerWorld on the latest release 9.0 Beta.