Very Deep Detector. I love being able to select high and or low conductors. I have only used it for relic and coin huntings so far. Being able to set high conductor and offsetting the GB to 3 or 4 with delay at 10us and finding coins in hunted out parks or school yards is neat as well. I cannot wait to try this PI machine on the beach. I wish it was water proof as well (hint, hint - White's).
I have owned many detectors over the years. Most of them I have sold off. The TDI SL is one of the keepers. I hunt beaches and use this particular machine on the beaches with heavy black sand. It is easy to set up and start hunting. It punches through wet sand with no problem. I have owned it for 4 years and used it heavily. Never has had a single problem.