I still like the old GUI more... it was easier to read the life/mana bars for both you and your pet. Camera also zooms out more and the gameplay is faster.
In saying that, I just had a quick bash as the beserker with some randoms and really enjoyed it. Item drops are still plentiful and the stash is nice and roomy (unlike Diablo 3... why the F do we have to pay to get more space?).
Looking forward to giving the Engineer a better try (now that I have some stuff waiting in the shared stash) as well as the other two classes.
It was good to see a respec function put in as well. The skills in Torchlight aren't as distinct as Diablo so some trial and error is a must.
Will definitely be getting this for my travel laptop since it can't run Diablo 3 for two reasons: weak graphics chipset and I won't have always on internet.