Okay, praise and criticism like a sandwich, here goes ...
I like the iPad layout a lot. TBH I tended to read through Safari on my iPad, so don't know how different it is, but I do like it.
This thread crashes the app on both elderly iPhone (3GS) and nearly-new iPad.
The emoticons are insane. Having emoticons which are totally different in an app as opposed to a browser is bizarre. Having ones which don't exist in a browser bizarrerer still. I can't see what most of the faces are supposed to be on the iPhone, and while I may not have a retina display on that I DO have perfect eyesight. Ner.
And there is no 'hmm' emoticon. That is my favourite emoticon ever, I often bemoan its absence at work (cos I feel that way a LOT at work).
When not crashing, both apps are nice and responsive. iPhone one always has been - I often resort to MNing when the signal is too weak to do anything else.