It's a great way of reading and writing in a forum on the device. No need to mess with browser-windows and zooming when consulting the forum. I am using a similar application made by XDA for reading their forum. A lot of forums these days are adding support for Tapatalk.
This is a good idea, however it doesn't support this version of vBulletin which is 3.6.
In the past I didn't want to upgrade the forum as the new versions didn't offer any new useful features.