I use Royal Oak briquettes exclusively in the WSM, mainly because it's all I can get around here, but I wouldn't switch even if I could.
It lights easily and burns steadily with a good charcoal smell. Temperature control is easy and ash production is very reasonable.
Using the Minion method, I've done at least a dozen 20-hour cooks without the need to refuel.
As Rick and Glenn say, it might take you a couple of cooks to get used to the different properties of Royal Oak, but I bet you stick with it once you do.