http://shop.rockminer.com/goods.php?id=35
Are you basically guaranteeing ROI within 2 months?

I just read everything there and from my understanding is that they guarantee a ROI for only 1 BTC, not for 2.

I think it is 1btc per xbox with a minimum of 2. Some clarification and/or an english translation would be nice.

What USB hub would be good to accommodate this (RX-BOX)?

Looks like they come with a usb hub and rpi.

Quote

With raspberry pie and Hub, does not include the power