I reproduce the result table, if you have no time to read the article:
A reader's comment:
A major piece of work by OakLeaf … has confirmed my suspicions about how inappropriate all the cloud name/value entity store technologies are for serious SaaS developers.
The Google AppEngine Datastore, Amazon’s SimpleDB and Windows Azure have chronic performance problems relative to conventional database throughput. Ultimately, the inherent inefficiencies of these storage options will hit hourly cloud renters in the pocket.