The 2500 is a fair to excellent detector depending on how deep your targets are located. With it's target size image you have a better chance of not digging up a old beer can because the detector has the right conductivity and would show coin on other machines. It is fairly accurate on it's ID, but of course the depth can be off if you don't have the target in the center of the coil just like other detectors. It is not really all that deep in my opinion, but that depends on your ground.
All detectors can find gold rings if you don't have the disc turned up to cancel out pull tabs. The expensive white gold rings usually show up in the foil range, so if you also want to find them you gotta dig a lot of foil too. Makes no difference which brand you buy, this is a fact or detecting. Best to also plan on getting a good premium set of headphones like Black Widow, or Grey Ghost, Killr Bees.
DetectorPro Professional Metal Detector Headphones