Changed my 5 stars to 2. When I got COIN Pro, I was enjoying myself. So I spent money on a sentinel as well! As soon as I did that, my COIN Pro "3x" disappeared and I was informed I'm currently receiving sentinel rewards (so this device has no inherent value - they just get another $50 out of you) and now I'm being told my COIN Pro is expired, I have my sentinel and get 0.12 Coin when i mine a tile. At 1 cent per XYO and 50 Coin to equal 1 XYO, these developers did a good job scamming me.