I too have an unopened box and am just waiting to find two good quart-sized bottles to store it in. I bought it specifically because I saw results on flickr for Adox CHS 50 and CHS 25 that looked amazing. I'm looking forward to trying it.
But I'm also inexperienced and need to be careful about going off in too many different directions. I've been using HC-110 and am homing in on good negatives for printing with hp5+ and tri-x. I'm not at a good place with acros yet. My first try with acros the negatives seem to look nice but I had trouble printing them. As much as I'm tempted to try some other developers, I think I have a lot to learn first with the one I'm using now! Diafine for me will be limited to my small stash of CHS film which I only use one sheet at a time. I'll switch away from it quickly if I can't get results similar to the ones that drew me to it in the first place.
I hope you will post some of your results!