I'd be interested in hearing as well. I just planted the Royal Lee & Minnie Royal trees up here. (Before someone tells me I'm stupid...I planted them knowing that they are an experiment. I know I may never see fruit because they may not tolerate the disease pressures in our humidity. But I think it's worth a try.)

Didn't have them for a year yet but I planted 4 cherries as an experiment myself around a month ago. Royal lee and mini royal broke dormancy and pushing out leaves now. Stell & Lapins - just now starting to bud-out. All on the new dwarf rootstock 3CR178.

I contacted nursery and they said to hold-off on head-cutting/pruning them until summer because of diseases.
Also, was suggested to paint them top to bottom with 50% water/50% white latex paint to protect form the sun.

Hopefully it worksout for all of us lol.

Mine are also on 3CR178 rootstock. They were planted mid-January and their first leaves are emerging now.

I painted mine, too, but the written instructions that came with my trees said to paint from just below the bottom branch to the ground, not all the way to the top. So that's what I did. Even the buds that are below the paint line are opening - the coating of paint isn't slowing them down at all.

My trees had already been head-cut so they would fit in the shipping box. I am not planning on doing any more pruning until next winter, except for rubbing off any buds that sprout too low to the ground.