I just finished watching the last disc of Princess Nine. I have to say this is a show that surprised me a lot. I initially got it because it was getting some good buzz over on http://www.animeondvd.com/. While I'm only a slight fan of baseball, I tend to enjoy baseball movies a lot so thought it would be a good chance to take.
While the show wasn't perfect, I really enjoyed it. They do a very good job with most of the characters and their interactions. I felt there were some weak points just past the middle of the series, but it pulled everything together quite nicely in the end. It reminded me slightly of Battle Athletes Victory as far as the feel of it (just without the psychotic characters and with some romance added in).