I used Habitica briefly a few years ago. It was fun, but it also had a lot of features and methods of handling things I didn't really take to.
I'm kinda interested in seeing LoA be part of it though, I'm in a place where I could realistically make good use of the site again if I don't spread myself out too much. So, I guess my vote is "I'd probably use Habitica because of LoA additions" rather than "I use it and would like a LoA addition", if that's worth anything. :)