I've been using Tapatalk for a couple of days now and have found it to be extremely easy to use, definitely worth the £1.99 that I was initially unwilling to part with.
If you're still having second thoughts, have a look at these screen-shots that I have just taken. Hopefully they will help to illustrate the user-friendly interface, and convince you that it's worth buying (and subscribing to Ten Tenths of course) if you haven't done so already...
Choose your forum category...
Have a look at the topics of discussion...
Open a thread to view the replies...
Create a reply the same way you would send a text message or email...
That's really all there is to it, and once you get the hang of the app it can be configured to suit you.