I have installed SS and it works fine with CPanel (users can login using their domain username/password). While it is very easy for the end-user, it is horrible to translate (if you are interested in translating). There are 2 language files plus about 2.000 occurances of text within other files plus images with text which have to be translated. If you just need an english speaking application, just go on and buy it. At 1.5 US$ one time fee per user, it is really worth every penny.
kosmo