Awesome episode. It lived up to my expectations...only problem I had with it was I thought that the streaks/lines from his eyes were like a dark reddish colour? Cuz if I remember correctly, when that manga chapter came out there was an officially coloured image of Grimmjow's ressurecion along with the chapter...it's the same image I used for my signature. Other than that though, I really like how Grimmjow looked. He looked a lot more feral compared to the manga. I think they did a great job.
EDIT: Forgot to mention that Ichigo's mask actually had teeth for once.. lol Yay!
EDIT 2: Just to further illustrate my previous point:
Fight back against Dordonii:
Fight against Grimmjow:
Why can't they animate at this quality for every episode??