Yes, rest bags are good for shooting, particularly because they are both affordable and versatile. You can use rest bags by themselves as front or rear bags or both. And because they are filled with a malleable medium, you can shape them to your specific needs each time.   As a bonus, when the bags are filled with a particularly heavy medium, they can be used in conjunction with another rest of your choice as a weight to help keep the main rest from moving around during firing and to help reduce recoil.