It looks pretty, but as said in the beta testing, it's just not really usable.
The new app just doesn't have the screen space. You can barely see a couple of posts at one time meaning to find an interesting one you have to be constantly scrolling.
Then there is also no indication for which posts you have already looked at. I'm on tsr enough that in forums I check most, I have looked at majority of the recent posts and on the app I can't see which ones they are. It's just worth looking for new ones using the app as you end up looking at all the ones you've already checked.
The only things that are improvements from the old app, to me personally, is that it looks pretty and that you can actually read and answer PM's. Although I would still prefer having a night mode.