I realise this is an old thread but I have just tested Rollei ATP 1.1 in the Rollei ATP DC (A+B) developer. I wanted to try the film just to see what it was like. I shot 2 rolls of 120 in the Alps in Austria at the ISO recommended in the developer instructions, ISO 40. I followed the instructions carefully and used distilled water as instructed. I am not pleased with the results. The film has developed OK it seems but it does not appear to have fixed properly. Looking at the negatives there are odd patches that have a coloured metallic sheen on the emulsion side and there is a foggy appearance too. Possibly this film was not stored properly but I don't know. When I bought the film a few weeks ago I found out it expired this month. As the film appeared insufficiently fixed I loaded it back on the reels (once dry) and fixed it again (fresh fixer). It doesn't appear to have made any difference. Disappointed, I went on to develop 3 rolls of Ilford Delta 400 and that is completely fine so at least my silly experimenting with odd films has not cost me my holiday photos! As I still have some of the special Rollei developer left I might try the ATP again to see if this is a one off bad result.
Edit: I went to cut the film to put it away in negative sleeves. As soon as I took the weight off the bottom of the film (it was hanging vertically to dry) it curled up like a pigs tail. Not just a bit but like a spring. Terrible. Other PET films like Rollei 400S do not do this. They curl a bit but they don't bunch up in a huge mess. Now not sure I will try this film again......