I understand that some folks come into a thread and contribute without having read the whole thing. Here's why I am hesitant to just run out and buy another Baader diagonal.
4 or 5 years ago, after getting a Celestron CR-150 and sorting it's issues out (one of which was replacing the gawdawful 1.25" mirror diagonal it came with), reading and research led me to buy a Baader T2 with both nosepieces and the eyepiece holder with builtin helical focuser. No question, it was much better than the mirror it replaced. I assumed I had obtained a high-performance piece of kit.
Over the next year or so, two things happened that changed my opinion on that.
1. I got an ES ED127, which stomped the 6" achro in detail and contrast. I was shocked when, after remounting it, the ES's mirror diagonal easily outperformed the Baader prism in every respect.
2. I got an 80mm reference flat and learned how to test diagonal mirrors and prisms using a contact flat. Then I could juxtapose my subjective impressions with some objective measurement.
And there it was, easy to see. The Baader diagonal is well-machined, but the prism was not high quality. See the photo: the fringe lines are curved, becoming wider and further apart from right to left, fanning out toward the top. According to the charts I have, this is a combination of astigmatism and "bent cone", with maybe some cylinder thrown in. No wonder the views were soft and contrast poor.
I bought used Orion and Vixen prism diagonals in the CN classifieds, and they both were superior.
So yes, I am definitely skeptical about running out and getting another Baader prism. You know the saying: "Burn me once..." Sure, there are many "good reports" on them, but I know from experience, subjective reports are relative to what one has and is accustomed to, and is subject to change in a flash. I haven't seen anyone else post a fringe test of their Baader diagonal.