They are distributors for Don's zappers, but don't care for the name.
I've used their product and can highly recommend it. Within a few days, my Candida symptoms were WAY down. They also have something called orgone pyramids which are awesome. I used one in my son's room as he couldn't sleep, and the next night he was fine. They have many more uses as well listed on their site.
As for the Africa Silverado, I tried to order from them and since I was in the US had nothing but problems with them processing my order. They were a bit snippy as well. So if you are in the US, I'd recommend buying one in the US. There are several distributors of Don's product, and other zappers as well, though I wouldn't trade mine for anything right now.