I always order the XL it lasts so much longer. I also will only get HP for my HP printer. I tried other inks but it only gave me problems. I rather pay the additional cost and have everything run smoothly.
The cartridge works fine unfortunately we are forced to buy only HP products and they are toooooooo overpriced. The cartridge cost as much as the printer it's like buying a new printer every time you have to print. I feel you are unreasonable not to allow your buyer to choose their own print cartridges.