I’ve had one since they were initially released and I gotta say, as a fan of minimalist wallets, they’re not as bad as some reviews have made them out to be, but they’re far from perfect.
I’ve *never* had an issue with the magnets not being strong enough, and it seems like the longer the wallet is in place, the stronger the hold is. Nor have a ever had a problem with it sliding off when putting it into or taking it out of a pocket, but I realize some pants have tighter pockets than mine, so YMMV.
That said, I do wish it held one more card, as three is juuuuust a little too constricting for my likes. I carry my ID, my Kroger debit card (you can use their app at checkout, but not at their gas pumps yet), and my debit card attached to the bank account I share with my wife for when I go somewhere that doesn’t have Apple Pay. I have one other debit card for my personal bank account that I’d like to carry for when Apple Pay isn’t accepted which I’m currently forced to leave out of the mix, but it’s not a deal breaker. It adds unwanted bulk to the phone already, so I can see why they didn’t make it hold more, but it’s still a compromise I have to deal with.