LRL questions.

[olympios]

The only unit I'm familiar with, is the Omnitron2 (from Dell Winders). I used that device a little over ten years ago. I found so much gold with it that I filled all my pockets and I had to leave the rest for some other pour soul to take!
Sorry guys, I had to say this, lol. When you get ripped-off, to only thing you can do is make fun of it!
Anyway, I see quite a few of them being advertised in the net, so I'd like to ask some questions. Those of you that are familiar with these units, answer the following questions for me, please.
1. Do I have to be a dowser in order to use one?
2. Do they really work or is this a scam?
3. This outfit: http://www.treasurenow.com/html/products.html invites clients to visit their shop for a free demo or training. If the units don't work as advertised, how are they gonna convince the client to buy one, especially when they cost up to $20,000?