Looks like Dyn has changed theirs; http://dyn.com/email-delivery-express/
Biggest thing I'm curious about from a data perspective concerns the science behind the thresholds they've set. You want to see where the break in usage or value is and make sure you capture 95% of that group. Power users of that plan are then pushed into the next plan accordingly.
If you click the link in the article it still is the older version.