I have been through a few of the pro 13 guns which usually cease and this gun is clearly a much higher quality and has a removable tip that can be replaced. Lined with teflon, there is far less risk of foam curing in the gun, better bead control (turns in "clicks" for precise changes in bead size, overall feels much more rugged than pro 13 gun. I personally use this in the pest control field and it is a useful tool for excluding pests from your home as well as insulating.