I use domain privacy not to hide from anybody, but just because I don't want anyone to connect all my various sites through a personal or business address. I've used a major privacy service loyally for years, and they always gave a very legitimate looking office address in Los Angeles. Their website still shows a variety of US-based addresses as examples of what you'll get. Since my sites are US-based, this is what I want - US people can mail or call as well as email.
Suddenly, that address has changed to one in Panama, and it doesn't even look very complete. That is, I wouldn't be sure what to write on an envelope to get a letter to them. It looks shady to me.
Should I be concerned? My sites are information based, and I don't plagiarize or do anything illegal or unethical, so chances are the people most likely to look at my WhoIS are not people who think I've wronged them, but nosy webmasters.
This is a very popular privacy service, so I'm sure many other sites are affected. Would you make a change under these circumstances, or just not worry about it?