Yes it does and the critical difference is that the customer doesn't have control over when instances are yanked. Likewise servers/drives aren't persistent so you can't have nodes hibernating and then bring them in response to pricing.
Our system is designed to let you control when servers are turned on or off in order to perform orderly computing. Likewise the fact that the servers and drives are persistent allows you to shut them down and back up again over peak times and keep data persistent. This is great if you are doing large jobs like 3d rendering for example.
