Ohsnap uses a metal ring that has 3M tape on one side. You tape that to your case, or as I did to the bottom of my MagSafe charger puck. Once stuck on there, it requires a lot of force and might to remove. I know, because I ruined my Apple clear case when I removed the metal ring. All I can say, is the metal ring isn't going to fall or pull off. Once you have the ring "glued, as I put it" you just snap on the grip. It works rather well.But Osnap uses Micro Adhesion so you're not actually glueing. I think that the magsafe magnet thing will end up being a failure.
Ohsnap seems reluctant to come out with a similar solution. They said they don’t see getting away from sticking the metal ring permanently to your device or case. For me, I am not going to permanently stick a metal ring on my leather case. And I don’t want to always use the grip. Maybe I'll attach the wallet at times, etc. I really think they're making a big mistake. Imagine how many people would buy their grip if it was made for MagSafe.
Anyways, I love my solution.