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Can you think of any disadvantages with this?
It may suggest to some that you have something to hide! (Even if you don't).
The only downside of a public registration is that you get some additional junk mail and some unwanted phone calls.
In reality I get huge amounts of unwanted junk mail that didn't come from a domain registrations, and the phone calls are quickly dismissed.
In terms of e-mail contact, I'd have thought that most private registration services would simply forward any mail received at your private WHOIS e-mail address, meaning that anyone who wanted to send a mail to this address would still be able to get in touch with you; this is how the private registrations I have work and don't see it being too different elsewhere.