When I was working with AliCloud I ran into an issue in that during peak hours, we'd want to scale-up, and they'd be "out of stock" of virtual instances... Which is fine if you have the budget to keep a load of instances running, but if your spike goes over what you expected, there's no resource left for you to scale up. Not sure if that's still the case, but scalability is perhaps the biggest draw for me to the cloud and it seemed AliCloud didn't really get that right.