I am using Root Riots for the first time right now. I used to use peat pellets (never tried rockwool as it wasn't available in my area), but someone more knowlegable than myself suggested I try Root Riot since we live in a very humid climate: Rock wool and peat pellets tend to stay too soggy sometimes. I soaked the pods in a mixture of rainwater, superthrive, Fox Farm's Microbe Brew, and a bit of molasses. Not sure if that was a good idea, but we will see. Underneath, I placed some coco coir that I'd soaked in that mixture as well. I usually use perlite when I want to increase humidity in a dome, but thought since I had coir sitting around I'd give it a try.
Once the pods were soaked I squeezed them out a bit and placed them back into the rack. Once I placed my seeds, which had not been soaked, into the holes I tore off a bit of a corner from the pods and plugged the holes with this. They are now outside with the vents closed. I've opened it up and aired it out for a few seconds this morning.
If anyone thinks this is a bad idea to soak in this mixture, please let me know. The other pods that were not used were removed and placed in a ziplock bag with a weaker mixure and placed in a dark cabinet.