You also get 1TB of storage with that, and unlimited storage with 5+ accounts. I do this for my family, and we all have unlimited backups and custom domain email.
Luckily, I do have a grandfathered plan where I can use Google Apps for my domain for free. But as I mentioned in another comment, I'm trying to reduce my linkages with Google, Facebook and others for privacy reasons. That's one of the reasons why I don't use that much (the other issue is dealing with changing my email addresses with everyone else I've shared those with - ad based free email providers like Yahoo do not offer mail forwarding out of their platforms for free).
