Traded one of my detectors for a 550 and got it today. Took it out to the local park for 2 hours. Ran it on factory settings except I set the sensitivity a little higher. I really like it so far. I was using the stock coil. I have a sniper on the way. The pinpointing is a breeze and it seems to really lock on most coins. With most of the trash I dug the id jumped around. I did not dig any deep targets but that was ok. They had not mowed the grass and it was probably 4-5 inches deep so that probably had a lot to do with it.