At pro is a very popular mid tier machine. Although if I were going to buy a VLF detector I think I would go with the Makro Racer 2. Just because it's one of the best single frequency detectors there is. It's at the higher end of VLF detectors though and a little more money. There are metal detector classified sites out there too where you can buy used and save some decent money, "Treasure related stuff" section on this forum is one of those classified sites, eBay is another, and a few more. As for pinpointing, not sure if you know the "wiggle" method but it can be a helpful technique. Here is a video showing how it's done. He's not using your detector but it still works the same. The method can be done by wiggling the coil over your target and slowly pulling the coil either toward you or away from you and listen for the target sound to drop off then wiggle it a couple more inches back toward the target until the sound comes back and the target will be right at the tip of the coil. It's a good way to tell the size of the target too. If the target pinpoints in the exact same spot going forward and backward then it is a small object like a coin. Seeing is more helpful than my words

here..
https://m.youtube.com/watch?v=4Rv_VrWjHUM