i have used the peat plugs for my biodome and have to admit it dosnt do as well as they should for cloning,(some worked and some didnt 50/50) i have never used rapid rooters. but now i have the dome and the styrofoam forms that fit the plugs that i think i will try coconut fibre in them instead of what they sell. i didnt use any cloning powder either. good art work stinky.