I just bought a Z30 and I'm absolutely f*cking loving it! I'm hoping someone here on the forum can tell me if it's worth investing in this accessory. I know there are many other higher capacity battery packs on the market, just wondering what people think of it that already have it. Also when the Z30 is fully discharged, how much of a charge will this bring the Z30 to if you just leave it and let it do it's thing? Thanks Y'all