Although not essential, one cannot really deny that a dedicated app is better, more compact, faster, and easier to use - especially when attaching/uploading photos, or links, etc.
I would use one if I had one, but i only rarely browse BITOG on the go, so I can nicely manage it on my iphone (4s) if I need to access it when I am outside.
BUT please don't say an app like tap-a-talk is not better than regular interface when using a smart phone/tablet etc - they ARE. in EVERY way.
(I am aware tap-atalk is not a free app, but one can use ALL forums with it, once you get it - AND the app store makes a normally paid app as 'app of the week' very often, and it's free for the week...you never know when tap-a-talk will get 'app of the week/free' status)