I picked up a used Gamma and two extra coils. (5" and 11"dd) I used the 11" coil first and practiced pinpointing with it. I marked the sweet spot on top of the coil with a silver sharpie. I then practiced with and without using pinpoint and am comfortable with it now. I had never used a dd coil before My favorite coil is the 5"dd,I love small coils. Today I pulled a 1915 buffalo,1926 and 1934 Wheaties from a lot that used to be an old church. I have been working this little trash infested lot for three years,and it keeps giving up old coins. I really like the Gamma audio.The two tones feature is great for working in heavy iron.It even has a unique sound when it overloads on large shallow iron. You also have modulated audio(shallow loud/deep softer sound) I had the sens as low as 5 and as high as 80 in some of the different sections. The ground grab feature is great.I am really looking forward to my upcoming Virginia relic rescue hunt with this machine. I learned a great Garrett propointer trick today. If your propointer gives a lot of false signals,or just wont "shut up",take a piece of tissue and ball it up and place it inside the cap so it prevents the battery from moving. I lived with a noisy propointer for a year,and was about to send it in for repair. It works like new again. Happy Hunting.