This is awesome! We now have the ability to fully customize the trade off between cost and interruption while still guaranteeing a base level of capacity/reliability.<p>This should make it much easier to run properly containerized web apps using (a percentage of) Spot instances without worrying.<p>In some cases the two minute Spot interruption warning time would be sufficient to launch a new instance and avoid a drop in capacity, but I don't get the impression that AWS handles this for you. I need to look into this some more.<p>Of course you shouldn't ignore the additional complexity this brings, so be sure to understand, design and test the different scaling and failure scenarios!