Benchmarking the new AWS Postgres RDS instances

Postgres has finally come to RDS!  Want to know how these instances stack up on a naive pgbench test?

Below is a table of simple pgbench results taken over a 60 second period.   All RDS instances were launched into us-east-1a, and pgbench (9.4devel) was run from an m2.4xlarge in us-east-1a as well.

TPS t1.micro m1.small m1.large cr1.8xlarge
Run 1 138.093179 57.018885 179.679616 258.866222
Run 2 116.202688 53.297961 173.538878 233.126021
Run 3 139.867496 52.476393 174.434619 257.679689