OK, really starting to like it now. I think it is really worth it!
Even though subsequent posts don't appear as compact, this is mitigated by choosing text size as small from settings. Larger posts are easier read on this version too, can't put my finger on why... I think those larger posts by themselves actually appear more compact.
I find the app to be faster and more responsive, especially when opening threads and posting. I had the occasional error with version 2 and so far none with version 4.
Youtube videos open up landscape and full screen, and you still have the option to reduce 'hq' quality. This is brilliant.
The screen when writing new posts is cleaner.
Naviagting between various sections, whether they be new unread threads, subscribed, or previously participated threads, is fast!
I think there are more notification options as well. I particularly like the option for notification if you are mentioned/quoted, or when someone pm's you.
Those are the main points I am picking up on now...
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