I really have a hard time believing the HP study. Re manufactured ink and toner is a huge boon for all the printer companies. Epson, HP and Canon and some others have within the last year relented their legal antics against toner remanufacturers. Epson and HP have said that drill and fill in a bad refill process that can ruin a printing device. Some remanufacturers are poor quality but I have been using twotonellc.com products for over 3 years with out one single issue, and did have some issue with HP cartridges purchased from a local retail chain for several laser printers. I am a stout believer in using remanufactured toner and ink cartridges. twotonellc.com has a multi million dollar research facility to create and test all products they release.