I recently bought a Walkera #4 fixed pitch heli from Xheli.com. It is defective. When I tried to contact them by phone, the parts support line gave me an out-of-service message. I tried the sales number (3 times), but no one answered. I sent e-mails and used their website contact service with no response. In my most recent e-mail, I gave them until January 11, 2008 to respond. If they do not, I am going to report them to the Internet Crime Complaint Center. My fear is that they are no longer in business.