I am your target customer (I think), I hate carrying around things in my pocket. But, this product doesn't really solve the issue. There are plenty of cases that hold cards... this case has a unique feature - it pops out cards mechanically. This doesn't solve the initial pain point. Infact, in my opinion, it adds a layer of complexity to a simple task. Now in order to eject a card, I need to open my phone (with password), open an app (I already have too many applications), find the card, then push eject. Not only is this more complex, but it's one more thing in my life that seems finicky. Something that could break, run out of battery, jam, etc - a simple card holder is a lot more appealing to me. I think you have a cool feature (can see where you left your card), but I'm not sure its enough.
Again, these are my thoughts. I don't know your business. Maybe I'm not your target customer. Wish you the best of luck as you move forward and figure things out. Hope this helps.