Transferring healthy plants to S/H

[Abbie9]

I've been considering transferring to S/H culture for a while, but haven't quite committed yet. I know that when changing environments the plant will have to develop new roots in order to thrive. My question is, if my plants are doing well in sphag or bark with healthy root systems, how will they react to being placed into S/H? Will they have to completely grow a new root system and therefore be "under the weather" for several years to get back to the same level of root system they currently have? What's the general length of downtime they will experience before being back to their normal selves?

I'm thinking of experimenting with some of my rescues first since they already need to grow whole new systems, but if I like S/H I'll want to switch all my plants over to it eventually. I am reluctant if it's going to mess up an already good thing with my healthy fellows.