In reply to Len.

My thoughts:
The customer is buying an off-brand product claiming to be 'the same as' the OEM cartridge. What's to say that replacement cartridge was filled to the same level as the original cartridge. When you would open the 'new' cartridge to empty it, whats to say that you got all the toner out? How does the printer determine how much toner is in the cartridge. Too many variables to consider.

Are they saying they are buying genuine HP refilled cartridges from HP? Then that's another story...

I agree with Len about the 20% less for a lot less money.