Believe it or not, some of the biggest roots I ever had shipped to me were on roses from Wayside about 6 years ago. They were monsters, almost like those that Zuzu showed us from EuroDesert.
They were much bigger than what I had been getting from J & P every year for the 20 years before that. I've always taken pics of shipments as they come in, and kept notes on what died and why. Definitely, bigger is better on roots!