Experience with launch-day iPhone purchases

Hey guys. Was wondering what has been your experience with iPhones (of whatever generation) purchased on launch day (i.e. obviously belonging to the first batch). I'm considering preordering the 5S and it will be the first iPhone I've had so early in the product's life. Nilay mentioned on the Live show yesterday experiencing some finish issues on the 5. So then, wait a while or go for it?