If you have a iPad or other tablet, you can simply your use browser to login to the forum and it works just as well as any app would.
Unfortunately for me I am using an iPhone so the website is a little cumbersome. I will probably end up switching to Android again in the future, get the app and a bigger screen. Would be nice to have the equivalent application available to Apple users too.
About 99.9% of my activity is via the browser on my machine, but I would probably be browsing the forums on the go with the application.