Well, my family has had Memory Maker on 2 trips. My DW and I enjoy adding this to our trip. I don't want to have to take pictures or ask people to take pictures of my family and I do have a nice smart phone with a good camera. It's just better and easier, in my opinion, to have Photo Pass CMs take the picture.
You do have to walk up to a Photo Pass CM (and sometimes there is a line waiting for pictures) and scan your MagicBand (or other ticket device with Memory Maker linked). After the CM scans your card, they take several pictures. Some of the pictures may include a Magic Shot where they add a character or a plus to the picture. For instance, in DLR, the CM added to my son's hands the Dr. Strange protective shields and my daughter had baby-Groot in her hand.
The Photo Pass folks are all over the parks. You can stop and take pictures whenever and wherever. My DW and I have commented that the Photo Pass CMs are consistently the nicest CMs to interact with.
The pictures will arrive and post to your
MDE account. I don't recall if it takes to the end of the night or it is right away. There may be some delay, but once you have the pictures, you can download them to any device (including a thumb drive). I have turned several photos into wall art.
The attraction photos will also be added to your MDE account. I don't know if you get two sets of photos because of Memory Maker and
Genie+, but I am assuming that you just get the one photo sent to your MDE. I believe that again the MagicBand scanned into the ride or read during the ride is what links the photo to your account, but I'm not techy.
I am a Memory Maker advocate. I think it is a worthwhile investment if you are going to take pictures in every park. Our family does, so it is a good thing.