We use Azure pretty seriously and overall, we really like it. We went with the MSFT stack due to some of our low level code to deal with printing. That being said, it's had it's share of outages, but honestly no less than if we were racking and stacking our own machines. The most frustrating thing though (with any cloud provider really) is that if it goes down all you can do is sit and wait...atleast if its our fault we feel like we're in control.