I use the DX-1 and love it. It works just like a search coil but made into a pin-pointer. You have every function you normally have with a coil such as discriminate or all-metal, ect. That comes in REALLY handy when the hole is full of rusty nails but you only want to pin-point the good target. There is often bits of metal that a regular pin-pointer will have you chasing if you cannot disc. I also like that if you find a really deep target that will not give accurate VDI you only have to get halfway to it and use the DX-1 and it is ALWAYS super accurate compared to ANY search coil. It is so small that it cannot be fooled by nulling, masking, ect. Also, being so small you can crank the sensitivity and use it to scan for gold flakes, tiny nuggets, ect, that are too small for even the smallest search coil.
Plus, You cannot lose a DX-1. Honestly, how many times have you wandered around looking for your pin-pointer after you walked away from the last hole you dug?