The story is interesting, although it is poorly explained, and too rushed. The newly introduced character, Baishin, is kinda interesting although it's not too original. It reminded me multiple times of Zaraki, since he can barely feel the slashes other people do to him. He has some interesting, unexplained techniques, but his story remains somewhat in the shadows (the basics are explained but with very little details). The rest of the characters are developed just as they are in the series, except maybe in the comical scenes, where Renji is dressed up as a "cop", shooting bullets carelessly.
Art is just as good as the series, with very nice fight scenes and detailed characters and surroundings. Most of the sounds and songs, as well, are taken directly from the series; they're fine.
I must say that this short OVA made me laugh a couple of times (Zaraki's train-chasing was pretty funny), and entertained me overall. If you're already into Bleach, I'd say you should watch this OVA, specially if you're just now finishing the Soul Society arch in the series.
