[Steve44]

We have about five HP 4200 printers in our office and I use genuine 38X toners which I think are rated at 12,000 pages.

When we get a Toner Low message it'll then do about 500 pages before it reports Toner Out, after that print will rapidly fade. We can probably scrape 1-200 pages on Toner Out, but it's not good enough quality to send out.

Basically their Low and Out warnings seem pretty accurate in my experience.