I tried mining it for a week. My iOS wallet now has a balance of 19.2 GRF. A lot of the buttons are grayed out. Can not pay, transfer, or look at transactions. I got the same profit per day as VRM.
Went back to VRM.
They are just in ICO period. Moreover, the IOS app stuck by Apple ban. You should help them a hand by sign in the charge.org link.
https://www.change.org/p/apple-get-apple-to-approve-an-app