No problem with power Doug. Cape Grace actually even has a power strip with 110 and American plugs.
Singita provides the adapter in your room. Of course be sure to have chargers and appliances that have automatic switching between 110 to 220.
Rovos is the only one I am not 100% sure of right now without looking it up but I bet I have that information at the office or on my web site.
South Africa is so geared for tourists with all their camera "stuff" I dont think you will have any problems at all.
