I'm very confident the magnet will not slip off my phone by accident. I couldn't shake it off no matter how vigorously I shook my phone.
I wish there were a slot to store that ring, but it will fit inside it. I might just keep it in a drawer at home though.
I've always carried a "billfold" style wallet in my back pocket, but I like the fact that this fits comfortably in my front pocket. I can shove my old wallet in my front pockets, but it's too bulky to feel comfortable that way. Your pockets may vary.
It took a little getting used to being able to pull the right card out at first, but now that I am I like it. The only negative to me isn't specific to this specific wallet, but the whole card-carrying wallet as opposed to a billfold. You can put folding money in this, but if you carry more than a few notes, you'll probably want something separate for those.
I just put 5 separate $1 bills in it and that with my ID and cards is about as much as I'd want to stuff in it I think. They could have been $100 bills, but they were ones and I folded them in half and then in half again so they do all fit snugly and don't stick out.
The pictures show it with those 5 bank notes and the cards I stuffed it. It'll hold more, but I don't need to. I'm also confident those aren't just going to fall out by accident. It's more likely something would fall out of the old style billfold I was using before this which I included for comparison.