I like that there is an optional add that you can display on your site that will decrease or eliminate the payout fee depending on what you are mining. There is a wordpress plugin to easily add mining to your wordpress site. You can test the mining script on their site without needing to install it on any site. Review collected by and hosted on G2.com.

I believe that the client for the mining has a separate fee that it takes out of the mining. But I had trouble finding what that fee was. Review collected by and hosted on G2.com.