I have made up my mind to buy 5xAmd R7 370

http://www.amazon.com/MSI-R7-370-GAMING-4G/dp/B00ZGF11YS

How efficient are those cards and how much MH/S would I be getting?

How much Watts of electricity would I be consuming in total?
Running these 24 hours what will be the ROI period in actual


I need Honest suggestions from some Experienced people.