I have a few khe giesha lights, one greyhound street & 2 crisman's and don't have side to side on any of them :-)
My son has a colony freecoaster on his street bike which I thought was smoother than the others so I purchased the rainbow colony and have been riding it about three months now with not one single drama (I know they are the same as the khe's but I think the colony & greyhound street are the smoothest I've ridden
*NOTE* Grease them before use even on brand new as they don't use hardly any grease in them !!
I take the two dust covers off each side bearing on the hub + the one you can get to on the driver pack those FULL of a good quality grease and replace covers fit and ride :-)