Can't get Dell toner cartridges at this price from Dell that's for sure. Some cartridges don't last as long but for the price you can't really argue too much. One cartridge last about 3 months of medium use printing.
I would probably advise Samsung owners to avoid this item, and consider consumable costs carefully in purchasing your next printer.
PROS: Cartridge fits ML-2525 and contains toner.
CONS: Samsung has firmware in their printers that checks the chip on toner cartridges for "authenticity" and complains if it doesn't recognize authentic Samsung merchandise. This cartridge for my printer is not recognized as authentic. I was able to get printing out of it by swapping the chip from another partly used cartridge. This also has the downside of the new cart apparently having a 2300 page count on it, so my error light is blinking red.
Thank you for your review. Keep in mind this is a Dell Toner, so it is only compatible with those type of printers so even though you may be able to use it for other manufacturers compatibility is not guaranteed. I hope this helps, thank you!