Since we get quite a lot of emails, I feel an update is in order. Yes, if you run an iStill 50 with the “old” PMM and you want to upgrade to the new one, that’s perfectly possible. If you promise to sent back the old PMM once the new one is in, costs are limited to € 100,-. Add maybe € 20,- for transport. Installing the new PMM is a piece of cake. Just as installing the old one was.