This is a limited offer from us to get attention and reviews of our site and the way we handle payments etc. The free 10 GH/s will last just as long as paid contracts - the industry standard - 5 years.
Scam industry standard, maybe. Mining industry standard, hell no. The best equipment available today wouldn't even mine profitably for more than 3 years with tiny difficulty increases.
People, you need to look at this logically. If you bought enough hash rate to have 1 miner all to yourself and you got all the payout from that miner until it became unprofitable, do you honestly think the company is then going to buy a new miner out of their pocket and give it to you for free? A "5 year contract" would mean they would have to do so, and possibly do so more than once.