I really don't understand why it has been chosen over S/MIME. Maybe they gave the money to that german guy who wrote it and now they don't want them to be completely wasted :)
Getting keys sign by CA is just as bad (or even worse -- you have to generate and then have that key signed by CA) than generating a key on OpenPGP scheme, and then there's the issue of cost. (Although I've seen some free ones out there.)
This usually means, that you press a button in your browser, the Browser generates public+private key, stores them in your Keychain (OSX for example), sends the public key to the CA and the CA mails you the certificate.
It's really done in seconds and for Mail.app or iOS mail you just need to enable S/MIME and sign/encrypt. There are many tutorials out there for various MUA. Except of Android nearly every popular MUA can speak S/MIME including Outlook, Thunderbird… [1] and many tutorials are out there [2].
[0] https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ke...
[1] https://gist.github.com/rmoriz/5945400#file-1_smime-clients-...
Facebook pledged to donate $50,000 a year to Koch’s project.
Thanks for corrections.