In case anyone here is interested in Tapatalk:
I've been using the beta for a couple of days now. Apart from a few bugs, it's actually a very nice app. Looks a lot better than Foroplex, it's quick and snappy, relatively stable (unlike Foroplex). There's some important features that are missing (search within a forum for instance) and it's pretty basic for now, so lets hope those things will be added gradually over time.
The good news is that the dev is quick to fix things. I emailed him some bugs yesterday and the majority of them were fixed in an update he released overnight. That's quite encouraging, I have to say.