*From a 2012 NA Lyra Research study, commisioned by HP. Results based on a total of 1009 HP monochrome LaserJet users who have used both Original HP and non-HP toner cartridges, of whom 424 experienced problems with non-HP cartridges. **Based on a QuallityLogic 2010 study comparing Original HP LaserJet monochrome toner cartridges to seven brands of non-HP toner cartridges sold in North America for the HP LaserJet P1505 and P4015 printers HP 36A and 64A and HP WW return rates in 2011 for HP Color and Monochrome LaserJet toner cartridges. These results in no way guarantee HP cartridge performance and do not constitute a warranty of any kind. HP will not be responsible for any damage caused by a faulty cartridge.