I would like to inform you that the Lexmark C544X1YG OEM High Yield Yellow Return Program Toner Cartridge I had ordered from you and which you delivered within just three days is working quite well. I am quite satisfied by the quality of this product and I hope to purchase another of the same very soon. The pricing of the Lexmark model I bought from you has had me telling a different story, that of me saving since I started using it, I have cut down on the printing costs. I guess the yield of up to 4000 pages is what is causing this positive result. Thank you for this difference!