The Great northern is a very well made, solid quiver. It holds the arrows securely, and is easy to take on and off. It also will not move on the bow.
I also have an EFA quiver, and it's great for one-piece longbows. You harddly know it's there. Not as easy to take on and off because you have to take the arrows out and slide the quiver parts onto the limbs. Otherwise the shot vibration loosens the quiver. They are very nice though. The foam isn't that great, and seems to wear out rather quickly.