I have only found the one nugget with my TDI SL so far but to be honest last summer I got into an area with really small gold and have been using my Gold Monster almost exclusively. This is tiny stuff I'm finding, no PI in the world would see it. I sure that if I had an SDC I'm pretty sure I'd be more confident too. It is in my opinion, from what I've seen, a better detector but I got what I got and I understand I have to work areas that help make the detector successful. I need to be close to or on bedrock.
I'm in Northern CA and working old mining areas. The ground is all over the place. Some areas are great, others so hot I won't use the VLF. And of course hot and cold rock galore! I really like the PI for those areas, far less rock digging with it lol.