I was under the impression Elby (Olli) still develops Clonedvd2, and Slysoft is a reseller (at least I know that was the case, originally when Slysoft started selling Clonedvd) of the same program. It seems plausible to me that both Elby and Slysoft develop this program now (but I'm not sure).
I know Anydvd was originally developed by Elby, but it is now developed by Slysoft. Similarly, Olli was also the original developer of Clonecd . . .
Clonedvd doesn't circumvent any copy protection at all; as such, the development and sales of that product didn't have to leave Switzerland due to legal complications. But in terms of buying the product, Slysoft offers better deals--especially package deals.