I must admit, it does look sleek. The features isn't much new, except maybe for the annotations being in the cloud. ( Not that my PRS 505 supports annotations)
Anyway, I wondered if it supported BN's DRM, since that would be a sign that T1 support it. So I added one of the freebies I downloaded recently, but it couldn't open it. Not that I really expected it too

.
Oh, and the way it Author Sorts, and that I cannot change it annoys me.