I’ve skimmed the other replies, so apologies if I repeat something here.
Generally I think the comments are great, work really well, and promote great discussions about the topic, easy to add your point and follow. I think some other forums overcomplicate adding comments which puts you off and the simplicity of this solution works very much in its favour, especially if you’re using a smartphone on the train or something.
Suggestions, that are not necessary, but as you are asking…
1. I think this has already been suggested but, being able to choose between displaying the comments as conversation threads (as current), or just a list by date/time would be great. It sometimes is difficult to know what has recently been added.
2. Ability to preview your comments, with the markup processed, before submitting. This would help prevent errors as, with the open nature of these comments compared to the forum, I imagine it is more difficult to identify for edit after.
3. Previously you were able to use buttons to add markup making it really easy. It’s not an issue for me being a developer, but maybe for some others this would help.