I'd say so. It's a natural follow-up to Sainthood, if you ask me. As for pre-Con material, I'd say give So Jealous a whirl. Before that, there are a few standout tracks on their first albums, but I wouldn't say that the whole product is anything amazing. Also, check out their acoustic live album, Get Along. Has the best version of "Not With You."
I picked up the new album and I dig it. A little different, more poppy than their older stuff, but still extremely catchy. I have heard So Jealous before, but I never got into it like The Con & Sainthood.