Following the Beck protocol, I have had a great experience with the RSG-1 from http://www.scadaresearch.com/. My Mother has also used it and brought her so many benefits that I brought her one for a birthday and christmas present combined. The RSG-2 is a cut down version without the Hulda Clark features, which you don't need if you are using the Beck Protocol. I have only ever used the Beck Protocol of the RSG-1, and feel 5 years younger.