This figure is nothing short of awesome. It's a major improvement on the previous OP figure. Colour's are better than previous model too.
Bot mode: He's lost a lot of weight and extra parts, and looks more film-esque. He's easier to pose, and in general, looks so much more 'there' as a robot.
Truck mode: Not many major changes. Looks a little less 'bitty', Looks more like the film truck (it even has the proper back of the cab). So all round, looking better in every way.
One quick note: I found it easier to change from Truck to bot than bot to truck. Bot to truck is fairly complex. But it's all part of the fun!
This figure stands... the previous falls.