I've had this for a couple of weeks now, so I can't speak to its longevity/durability. I ordered it to keep my phone out of my pocket - recently switched to iPhone XR and I feel like it's a very fragile device, plus it has a super high radiation output rating (specific absorption rate, or SAR), so yeah, I don't want it parked so close to my man parts and figured a holster would be better than holding a phone in my hand all the time.
The good: -seems pretty well built for what it is -the softer part of the velcro is on the flap; the spikes are on the outside of the pouch, so no chance of scratching your screen if you don't hold the flap up with one hand while pulling the phone out with the other. -fairly wide belt loop that doesn't limit you to thin belts -iPhone XR fits perfectly with a UAG Monarch case on it. It is not difficult to get the phone in or out of this holster. The phone does not rattle around inside; it's snug and secure and never feels like it will fall out.
the not so good: -it flexes a bit; isn't rigid. That's a double edged sword, because if it was more rigid, it would hurt if you bend over or sit down, but this also means that it would not be a good idea to keep your phone in it while you are driving or sitting in a car, because your phone will flex and then eventually suffer flexion damage (note: this doesn't mean your phone will be or remain visibly bent, but that the internal board will bend and return to place, which is what causes problems). I take my phone out of this case before I get into my car or before I sit down on anything but a high stool. -even with the phone out, it still presses against you firmly if sitting down, so you will always know the holster is there
What would make it (or others like this) better? I'd say something like a long blade knife sheath that has a high belt loop, but the actual part that holds the device to be below that, allowing it to move up and back down with your movement, so that the device doesn't bend or jam you in the leg or waist if you are sitting, bending or moving around.
All in all, this is a very good phone holster and I'm happy with it. If only I could be happy with the awful iPhone...