Frank, I've also ordered from GH Wild in the fall and the spring. I find I have to keep an eye on the spring planted peonies, to make sure they don't get too dry, before they have a chance to develop some roots. They have all done fine.
Here are is Vanilla Raspberry Swirl, a recent purchase from a co-op where the plants were dug last fall and kept in a cooler, that I planted this week. It already seems to be increasing in size. Our weather has been cool and rainy.