Aweber or Mail Chimp

I'm new to email marketing and I recently signed up for Mail Chimp.  Lovin it so far. 

Has anyone used Mail Chimp?  My question is can I use Mail Chimp's Auto Responder feature to run a small email campaign for folks who sign-up on my blog's email list (http://socialtegic.com)? 

A ton of experts use Aweber so I wasn't sure if Mail Chimp would accomplish the same thing.

Any help would be great... thanks.