I didn't expect it to be so strong but after attaching it the first time, I understood why it is so praised and different from others.
Up until this one, I had 2 others, different brands but both came with their own problems: one of them was too strong magnet and I thought the leather would come off the case rather than the magnets between them and another, it didn't hold well enough and a short shock could detach it.
This one, is right in between... strong enough to hold the phone but not so strong that it would come off with the case off the phone.

I do not have an Iphone, so I made a gift to one of my friends. He is very happy with this product. The magnet works well, and the product is well designed, so it does not scratch the back of the phone. I recomend this product.

I'm using the MagGo with an ESR Magsafe adaptor on a samsung z fold 4 and once it's positioned on the phone it stays there nice and sturdy and I'm sure my phone won't come off, even if shaking it pretty hard. The MagGo makes holding the phone with one hand feel safe even when I'm using it unfolded and it doubles as a phone stand, ideal for both watching contents and drawing. It's a must have for people that don't want to stick a bulky phone holder on the back of theyr phones with glue or double sided tape. The MagGo is very slim by the way, having it attached to the phone in your pocket is pretty forgiving and the z fold is double the thickness of a normal phone!!