Hello I am thinking about purchasing the Xterra 70 as my first detector.Can anyone tell me how it is as far as easy or hard to use for a beginner.Also would like to know how it does for mainly coins and jewelry and occasionally nugget hunting.I live in Northern Nevada which is very high in mineralization.Has anyone had to have them repaired and how was the service?Are there other detectors in this price range that compete with the Xterra 70?Thanks for any information.