Just wanted to suggest an option to sort comments by date alone - displaying them linearly in a 'flat' rather than nested/threaded view, perhaps with a reference to the post being responded to where applicable.
At the moment, it's difficult to follow the most recent comments in a deal. Unless, of course, something like this is already available but which I've completely overlooked :D
I think this would be difficult to follow, replies would be out of context, especially is someone posts a reply like "Me too, the same thing happened to me." You have no idea what it refers to, short of quoting the original comment. This sort of happens the way you want if you subscribe to the deal, and get the new comments posted emailed to you. That way they are sorted by date in your email program, and they include the original quoted message.