The biggest thing I have found about lambda is that if you plan to deploy with cloudformation backed by s3 you either need to do some hacks to ever update your

The biggest thing I have found about lambda is that if you plan to deploy with cloudformation backed by s3 you either need to do some hacks to ever update your function, manage versions in s3 or change the filename in s3 and cloudformation to trigger an update. It's a rather annoying issue. I really wish that there was an always update flag on the cloudformation property to resolve this.