I have a small office and ordered repeatedly from InkTonerStore for my Xerox Phaser 6180MFP. Most of the cartridges leaked, streaked and otherwise made a mess of my work product. I spent a lot of time trying to resolve the problems and, while there were some refunds and replacement orders, I ended up with a shelf full of cartridges that were so bad I got fed up and decided never to buy these from ITS again. I wrote many times - advising of the lack of quality control and they basically said they're too busy to check the cartridges - so I should rely on the return policy. When I asked for store credit for some they wouldn't warranty/refund, they said no. Sorry, but they've lost my business ... I wasted way too much time and work product.