Well I got my DFX in the mail last May, and since then I've found 41 silver coins, 1 V Nickle, 1 Buffalo Nickle and a huge amount of the Wheat Cents, Plenty of relics too, including 3 watch fobs.
I'm very pleased with the DFX. There is a learning curve that goes with it as well. Custom programs are available through various sources. dfxonly.com being where I got my favorite.
Whites has been around for a long time and is an American made machine if that makes a difference for you.