It was somewhat disappointing. First playthrough was great, but the game crashed *a lot* on my NG+ playthrough. Like 20-30 times. I think it had to do with my character build and the amount of damage I was doing, because I was very overpowered. I actually had to nerf some of my stats and weapons to make it through to the end.
I didn't have those problems on the 360, but I also did a physical strength build on there instead of the magical one I did for this playthrough.
Other than the crashing the game is superior in every way to the last gen version, though, and not everyone experiences the crashing - although I did read a lot of other people having the NG+ issues I was having.