I don't doubt that it worked for you Thomas, but I am talking a sometimes 6 month gap. I didn't trust it after that length of time. If it was easy to get and wasn't expensive I would still use it. I liked it, especially for skin tones, but the hassle was too much.
You should give Edwal 10 a whirl if you haven't already. It seems like we appreciate the same developers as we have discussed a bit in the past. Edwal 10 is basically Edwal 12 without the PPD. The result is the grain is not as fine, but the contrast doesn't get out of control. Edwal 10 is more an all purpose developer with the nice glycin bump.
After all these years of messing around, my favorite developers are Rodinal (I use something close to Gainer's EZ formula), Pyrocat-PC, and the Edwals (10/12).