I used to hire sdc 2300s. Went out a lot in the Dunolly, Maryborough areas. Took me 5-10 trips before I found my first gold sub 0.1 piece of gold. On subsequent trips I found more, two or three 0.1 g pieces a trip. Then the gpx 6000 became available to hire. I detected the same areas and found more gold, and larger deeper gold, up to 3g and up to 35 cm deep. My skills increased over that time. I learned to hear deeper targets which are broader and not so easily distinguishable from ground noise. As soon as I started with the 6000 I noticed the difference though. It’s much less chattery than the sdc, the signals are more distinct and it punches much deeper. The difference seems quite significant to me. I now own a 6000. It hasn’t paid for itself and maybe won’t as I probably won’t sell what I’ve found, but there’s more than an ounce in my jar now.