A 2007 independent study, performed by QualityLogic Inc. and commissioned by HP compared Original HP LaserJet print cartridges with nine brands of remanufactured toner cartridges sold in North America for the HP LaserJet 2300 (Q2473A) and HP LaserJet 4350 (Q5407A) printers. QualityLogic tested and compared 24 cartridges for each brand in the study. See the QualityLogic report for details (www.qualitylogic.com)