[…] the differences between each of these can sometimes be subtle, but they can also make or break your project. […] The result of those subtle differences is that, unlike the SQL world, you can’t architect a NoSQL based system without having extreme confidence in the specific platform you’ve chosen. There is no reasonable migration path from Cassandra to Membase, for example.
Very, very true.
Original title and link: NoSQL, NoProblem (Not Really… but it’s still awesome) (NoSQL databases © myNoSQL)