Ooh, that is nice. Definitely improved since I checked it out a couple of years back. I wish it had tap to collapse on comments though. Tap and hold is okay though.
When I originally switched to Android a few years ago I definitely had Alien Blue jealousy, but Reddit Sync has come a long way. Now I have Reddit Sync envy on my iPad. Plus, Alien Blue was so dominant that the competition on iOS was quite stagnant in comparison to Android, where there are several high-calibre clients.
you can tap on the bar extending from the poster's username to collapse the comment.
All that does for me is highlight the comment. Maybe it's broken on the L Preview?