Just a quick note: Like @Piotrus below, I'm missing an easy way to ping the person I'm replying to (this should either be default and automatic, or a simple checkbox "Notify user?" that remembers its state), and a signature with "--" in front like what the 2010 wikitext editor's signature button does (it's not intuitive to have to change the full .sig in the preferences to get this; it should be documented in something FAQ-ish at least).
Topic on Talk:Talk pages project/Replying/Flow
Please see my question in the other discussion about how to set up the prefs.