Its nice but the mitigation with the dks is alot trust me. I try resto druid 4 dks in pvp and its tidious getting everyone to stack. If your gonna do dks and resto druid do horde tauren. They have a larger hit box so they dont need to be stacked on each other. Dk tanks are mitigation intensive themselves even more so then the dps side. But i cant throw ne one off what they want to try. Go ahead and try it yourself use ur druid as healing even in ramps so u can get an idea how to work them and see how u like it.