No it's an included n9 app and I wouldn't depend on it.
My phone was dead and lost in a car so I sent a location request and lock request. I found the phone and charged it and it didn't bother to lock or send the location. It only worked when I sent yet another request after that. Maybe it broke in PR 1.2? They didn't respond to my support request in 24 hours so I'm not sure they care if it doesn't work.