In reply to Rebekah.

Maybe they just offer another solution for people who are not satisfied with Yoast plugin ... Both plugins are listed free in WP directory, so there is not such thing as customers, clients ... just users who use some plugin.
If some code does not work well for those users, its great that there is different solution. This post is not on Yoast website, this is global community site, very open to everyone. So if any developer make plugin what he think do better job than Yoast, its right place to show up here, why not?
Btw. Tony does not attack Joost or his plugin, just offer his solution for everyone free.