It's been talked many times. Depends on your electricity rate. If it's zero $/kWh or really close to it then you will ROI, if it's above 0.01-0.02 $/kWh then you will not.
Actually
i will use this site genesis-mining.com
and another Q
the 30 G/h have Expiration date ?
and i am sorry as i said new in this .