privacyprotect.org, is that safe?

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Anyboy known privacyprotect.org ? They said that they can protect you domains registration information not be made publicly available! They said" When you enable Privacy Protection on a domain name, we replace all your publicly visible contact details with alternate contact information ,so that when a WHOIS query is performed on the domain, an alternate mailing address, email address and phone number are displayed. You retain full ownership of the domain and have complete control of it." i have my own domain name. so,i received many spam e-mail by email that i have wrote down in registration information ,everyday. i just want to known if anybody have used it services? Is that safe ?Can they steal my domain name? please give me some advices!thanks