Great detector. I have found plenty of nuggets with my GB2, its an excellent machine for all sizes of gold. Be sure to use a set of headphones and learn the sound of gold tho. Headphones are most important with this machine. Manual ground balance is easy to do, just be sure to stay on top of it as you move along it will make life a lot easier. No need to run max sensitivity, I run at about 7 on sensitivity and max volume, running on max sensitivity all the time will just wear it out quicker and it will pick up more hot rocks. I still find fly poop with it at 7.