After a few days, some observations.
1) The lack of an account, like Disqus, makes it impossible to keep track of one's comments. Sure, I can click on my name below and see some recent ones, but not a complete list. There's also no ability to see what others have said, in the same thread or other threads. Losing context of anyone's comments is poor.
2) No HTML support. I like to provide links to support my statements, and other than simply putting the URL in the post, there's no way to do so. Also, a total lack of character formatting. No bold, no italics, no underlining, no image linking (disabled under Disqus but quite valuable anyway), etc., etc.
3) No notification system, other than email. Why should I have to check email continually? Disqus did this much better.
4) I've been asked to rate the same comment more than once. Why?
5) The very short limit on comments. Why - aping Twitter? Not everything can be summarized in so few words.

Overall, a *giant* step backwards from Disqus.