Should have added that I know a grower on another forum who had some clones he planted originally in rockwool. The cuttings survived for a few weeks in the wool, but never produced any roots. At one point he even managed to burn them with Clonex.

Then he transferred them to the Rapid Rooters and within a few days he had roots everywhere.

So from what I'm hearing they're good stuff. And, yeah, I love that you can use them in either soil or hydro. Makes life a lot easier for us indecisive types lol.