Imo the pros of a substrate outweigh the only con it has and its not like it happens every time you feed. Be aware though, i have talked to people who has kept their snakes on newspapers for years and they said the snakes started to take on a more flattened pancake look to them since they could never get grip with newspaper, they would flatten themselves out to create as much surface area to try and compensate. Now whether this is BS or not, I have heard it from a few guys. Snakes naturally dont live on a slick surface. It would be like you doing nothing but walking around on hardwood floors in socks. After years of it, i imagine you would lose some of your skills at walking on a solid non slip surface.