Amazon High I/O instances

Since Amazon has added new high I/O instance types and EBS volumes, anyone has done some benchmark of PostgreSQL on them ?

I will be testing my app soon, but was curious to know if others have done some tests so I can compare / have a rough idea to what to expect. Looking on Google, I found an article about MySQL (http://palominodb.com/blog/2012/07/24/palomino-evaluates-amazon%E2%80%99s-new-high-io-ssd-instances), but nothing about PostgresSQL.

Thanks !

Sébastien