Hi Scary Hunter,
I used to own a Pulse Star II pro and a Notsi Mole Impulse Pro. I consider that the Pulse Star II Pro detector is far better than the Notsi, but I can not compare it against the Lorenz because I never have had one of those units.
If you are trying to find something at about 6 meters then you can discard the Deepers, because they are not offering the 80x80 inches coil (2x2 meters), and you will need it to get to that deep.
The Notsi and the Pulse Star can do it, both have the 2x2 meters coil. If you try to find coins or small objects too then the Notsi is not the correct device, they do not offer small coils but, on the other hand they have a 3 by 3 meters coil while the Pulse Star's bigger coil is 2x2 meters as the Lorenz LPX2. The Notsi can go deeper.
The Pulse Star is easier to stabilize or balance, and it is more practical to carry, and it has a lot of accesories and coils. You can use it as a general purpose detector, it is good to find small objects like coins and bigger objects like a chest or a "cantaro lleno de monedas de oro y plata".
I recommend the Pulse Star II Pro because I do not know the lorenz. The disadvantages of the Notsi are the hard to balance it is, it is good to find big objects only and the lower quality components. A nice device for big treasures, but not as good as the other one.
I would like to know which detector is better between the Pulse Star and the Lorenz LPX2, if you buy the Lorenz LPX2 please let us know your opinion about the detector. The Lorenz looks good in the pictures, I mean it looks well-made.
Thanks!