Yeah I had Tapatalk 4 before (and the normal Tapatalk before that), but my phone told me this morning that there was a further upgrade available to Tapatalk 4.
I'm now using v 4.0.12, which is excellent.
Heads up seeing as I've just downloaded it. I wasn't a fan of tapatalk 4 before this beta update, but they've sorted out some major issues. The split screen when you first enter a site and the slow speed opening up threads are seemingly both resolved. Much more useable!