SPEEDYINKS Compatible Toner Cartridge Replacement for HP 05X CE505X High Yield (Black)

Arrived bang on time and I've already printed well over 3000 sheets on the cartridge without any signs of it running out. I've ordered another. Total bargain. I wonder.. Do they want the empty ones back? Also.. Maybe if they put their sticker on the cartridge so next time I run out I remember to order from them.. Could be a good idea.