Last year I used the Rootriot cubes for some and others I rooted in my normal growing mix (adjusted the %s a bit) in the U-Line bags Jon has discussed. This year I'll use mostly the latter. I like a homogenous mix in the container. Plus, to move them into the containers, I only need to cut the bottom of the bag, fill around it with growing mix, then pull the bag up and out. There are very few broken/torn roots.
The cubes worked great for rooting, but I lost a lot of cuttings after potting up. It seemed like the material in the cubes held more water than the rest of the container.