1. Wrong model shipped without authorization.2. Ordered refurbished item, however item sent was well used and and in poor apearance. Luckily it was substituted item and returned.3. When I returned the wrong item I was still charged shipping and I had to proof that the item was returned and they received it. Luckily I saved the USPS bar code. Called on January 5th. and I was told that had not been received and yet the USPS confirmed that the item was received on December 29, 2006. Without that proof I would have you know what. I was not going to argue about the shipping cost for something that I did not order because I have better things to do.ONLY SOLUTION WILL NEVER BE ORDERING FROM AMAZON AGAIN. THANKS FOR FOR THE POOR SERVICE.Kenneth S. Singleton, DDS