I read somewhere that some people only visit forums via their mobile phone in which case Tapatalk could be a great tool for webmasters to attract more members. I however have disabled sign ups via Tapatalk because all we get is a username and password and no other details. It's good to get some information about a new member in order to keep out spam and trouble makers.
Really. I downloaded their new beta version for free via Google Play. So far I had no issues with it. I also heard they would make it paid once it is out of beta and merge it with Tapatalk HD. If you are installing it for the first time, I would suggest you to try the beta first just to get to know the app.
By the way if you are not happy with a purchase, certain app developers offer refund. I am not sure if that is the case with Tapatalk since I haven't bought anything from them yet.
Since the upgrade of the forum software, Tapatalk had been giving errors so I decided to temporarily disable it till Tapatalk releases a compatible version for us. Some of us webmaster have already notified them and they told us they will be releasing a new version soon. Until then, this and some other forums won't be accessible via their app.