You can read their reviews here:  http://bittrust.org/genesis-mining. Filter out the obvious outliers and advertisements and the image you get will be about the same as most people's impression is of genesis mining.

It is a legit site, probably legitimately mining as well. But we don't know if they are mining on fractional reserve or full reserve. It's hard to tell when you don't have public access to their mining facilities overseas.

They're not going to steal your coins but they are going to offer you unprofitable investment options and market them as profitable ones. Payouts as you can see in the reviews are quite unreliable, sometimes your payout can be missing for days or weeks as well. Support isn't the best either. I would suggest that you do some further thinking and research before deciding to invest with them.