I too had a very bad experience buying a HP4288 Printer/Scanner/Copier.
The Scanner would never give the proper colour output in the scanned images. When this was brought to the notice of the company, they took the machine for service. Even after a month I did not get back the scanner replaced or my complaint rectified. After repeated requests they say that this is the technology they are using and there is nothing much that can be done about it. Can you ever think of your sparkling white shirt showing a pink hue or your sky blue saree being shown in an odd green colour in the scanned image?
This is HP all about. So friends when you go for an HP Product, think twice and double cross check with you vendor. I had to come to this decision after such a harrowing experience with HP.
This is a notice to all prospective HP product buyers...