I just got my Megadap and have started some initial playing with this adapter.
It works quite well with autofocus. A bit noisy and slow but I knew that before purchase and it works as expected.
I had some fun using an old Voigtländer 10,5cm f3.5 Heliar lens in a Compur shutter from a trashed Bergheil folder. I set Compur to Z to have open shutter.
It was possible to attach extenders so infinity focus with Megadap was possible and down to 2 - 2.5m distance.
The image attached of books is a cropped image with Heliar set to f5.6 at about 2.5m distance. This just to check how good AF worked and it worked quite well.
I think this setup if the most heavy I will use with this adapter. I guess lens could be about 90 years old or so?