I got one last year and love it. I've been relic hunting for 4 years with the Tejon and I like the it but I have to dig everything so I don't miss any good tagets. The Tejon is a great machine for the woods when your not in alot of trash or alot of bad soil. The AT Pro will win the battle in those type spots. I noticed that when the GB is higher the VDI# is higher. Bullets normally read 58 or 59 when GB is 79 or 80. When GB is 83 or 84 bullets will ring in at 65 or 66.