Hey Everyone! I have an opportunity to buy a slightly used Tesoro Sand Shark at a decent price and I was wondering if some of you PI detectorists could spare some advice. I use the Excal II but wouldn't mind adding a PI to the arsenal. I'd really like to hear every ones opinion about depth,stability,etc... Just how deep is a PI and are some makes deeper than another? I would also consider a Whites DF or an Infinium, but I know so little about PI I dont know why some are $1100 dollars and some are $550? Do some have more features or better tones? It's funny the more questions I ask about metal detecting the more I realize I don't know jack still....hahaha. Thanks in advance for your opinions.