I think in my title is actually been told everything. Got myself the HP LaserJet P1566 for my studies. 29 December 2011 I bought this toner. Have just the self-test page printed (Resume button for a few seconds press). Right at the bottom of the sheet is "1047 Pages" printed with the original toner was in the supply of the printer with this and now "2730 Pages" printed with this toner. And the quality is perfect, no difference to the included genuine toner. For more than 300 pages, the lamp blinks while the toner allegedly contains very little "ink", but it prints still without stripes or dropouts. 5 stars from me.