I got no issues while closed.. when open its ok too, up to a reasonable speed.
It can get a bit much (specially on a windy day) above maybe like 60, but hey, its a huge freaking open top... so its understandable.
One thing though (!).. if it ever stops working while in open position - do yourself a (very expensive) favor - & DO NOT try pull it closed with your hands/pliers or similar!
cheers..