I wouldn't say this is a bad choice, but personally I wouldn't go for it. I think it is too much of a risk quality-wise. For mining you want to go with a very high quality PSU. For example, I would buy a Corsair HX 850w over this. Yes, it's more expensive, and yes it has a lower power rating, but it's more efficient and the quality is much better. In this price, there are other good choices as well from Corsair or Seasonic (both excellent brands). A few others:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817171049or
http://www.newegg.com/Product/Product.aspx?Item=N82E16817153127