I have a very serious suggestion for any potential buyers. If you are looking for gold and other small objects deep, I would buy the 800. It's top frequency is 40 khz. The 600's top frequency is 15 khz. My own lawn is a bizarre place. My kids lost tons of metal there, I lost a lot of coins cleaning out the cars and not being careful about it, the 1890's house at the top of the hill threw a lot of stuff down over the hill including silver coins and rings. The 1780's house at the other end of the property has provided a few late colonial items. When I had my single frequency 15 khz machine and my other single frequency machine about 5 khz, I found some of the big stuff, coins by themselves, toy cars, sinkers from the boat, etc. Since the last machine purchase last August, I have killed it running 28khz and 74 khz. I am now pulling out gold, silver, small brass objects way deep, etc. There are still surface coins, toy cars, aluminum cans I hit with the lawnmower (deliberately) and sinkers, good Lord, enough of the sinkers already.
The 40khz setting on the 800 is going to lay the EQ 600 to waste regarding gold, silver and small relics that are deep.
I would sincerely suggest you get the 800. It will have way more potential.