Wavemachine Labs haven't sent over a review copy of Auria yet. I was assured I had one coming, back in January when it was first announced, so I had hoped to have a review for you by now. Russ over at Pro Tools Expert has already put out a nice review.
I noticed there seemed to be some graphic stuttering when scaling and navigating. I've asked them about which iPad model was used here, to see if that is just a problem with iPad 1/2s. Edit: Chris pointed out in the comments that he starts off saying it is an iPad 2!
I wish British reviewers were more critical, but (with the exception of Nick Batt) they all see to be dangerously polite.