I worked for a licensed professional cable installer. We used to use Arrow staple guns only but found that if a staple jams inside, it is very hard to remove it because the Arrow staple gun is a closed design and it is very hard to open it up to see and remove any jammed staples. I did some research and found Acme. The great feature of ACME is that when you remove the staple loader, the staple gun is open at the bottom so any jammed staple can be seen and removed easily. We bought a total of 3 ACME staple guns. So far, I have not experienced any jammed staples. One gun did have some problem but fortunately ACME stepped up and actually replaced the defective gun with a brand new one. I am a happy customer now.