Review on F-ink 5 Bottles Ink and Ink Refill Kits: Compatible with HP Inkjet Ink Cartridges 67XL 662XL 664XL 60XL 61XL 62XL 63XL 64XL 65XL 92XL 94XL 901XL-Ink Tools for Cartridge Reuse by Joel Wright

Works great when used as directed. Costco sold 2 packs (color and black) of HP 63 cartridges for about $80 from the factory. I've saved $60 so far and hundreds more in the future. Make sure you try to refill before you run out of ink to keep the nozzles from drying out. Additionally, if the black cartridge is new and you have a digital scale, I recommend weighing and recording the weight. This makes it easier for you to fill it out. However, the color can be a little tricky.