According to hp and their best suggestion. Always order the XL cartridges
931933
I had ordered two cartridges - Checked expiration date that indicated April 2017, made in Ireland, but cartridges were defective.  After hours with hp customer support, they sent me a new XL ink cartridge #63 (apparently there are two sizes) and all of my printer errors and printing problems were solved.  I don't understand why a new cartridge should be defective.  Guess I should test every cartridge upon receipt? Both cartridges I ordered were defective upon opening. According to hp and their best suggestion. Always order the XL cartridges....
162347
Even though you can buy less expensive ink cartridges, hp in my opinion are the best. The ink is full, clear and vibrant.
1599128
Update: while the cartridges still don't fit, I have had a great experience with the vendor. The company was very responsive, identified the mistake and have made arrangements to replace the ones. Good folks.
HINT: don't trust the Amazon web site to have the right cartridge/printer match up. Just be sure that the cartridges recommended by the web site have the same number (i.e. 226) as the OEM
Original comment: They don't fit in the printer; the cartridges are too long for the slot.
They are labeled 'XL.'
Having suffered this mistake with another vendor, I took great care to order standard capacity, as described in this product description.
I guess I'll return these.
1486713
I'm going to review all colors for our HP Printer right here.  They are expensive, but we NEVER have problems with them and wouldn't consider anything but the real HP laser cartridges.
2391597
You can always depend upon real HP cartridges. They may be more expensive but after market cartridges fail and cause the printer issues
899177
I always use the HP brand toners and never have a problem with them.
I use my printer constantly and the cartridges last a long time.
1606593
You might be able to find slightly cheaper similar cartridges but I cannot vouch for those.  However,  the one from LINKYO is about as good as the original HP for less than a third of the price.  I will certainly recommend LINKYO products to my friends.
3388856
The products... ALL products I've purchased from these guys are always the best and they don't screw around and make me wait for weeks to get them!  NEVER has it taken more than a few days after ordering to get whatever I ordered in my hand.  I just wish I knew this was possible long before paying thousands of wasted dollars to HP and Lexmark!  Do yourself a HUGE favor and put your trust in these folks... they'll deliver for you and save you a ton o' dough in the process!

EXCELLENT!!
2165941
Again, very good product and much cheaper than the HP cartridges.  No problem with my printer at all.  I will continue to us.e
4094551
I should have ordered 564XL.  The cartridge did not last vary long.  I have subsequently ordered a knock-off and paid 25% of the cost of the HP brand and am satisfied with the other brand.
4486347
*Update: I ordered two of these (HP) 61 XL ink cartridges, & I can't believe I haven't even had to open the second one yet! I've gone thru 600 pages of copy paper so far...yes, 600! The print quality is still just as great as the first page. I don't know how its lasting so long, real HP XL cartridges don't even last this long! I'm so glad that I purchased these!!! I'm saving a fortune. 

Great economical product for a busy senior nursing student in college trying to keep her 4.0. I refuse to not print hardcopies of research, assignments, etc., etc., but also refuse to spend a penny more of my student loan in ink then I absolutely have to in order to do so. This product had good reviews so I took a shot and ordered a 2 pack (of "HP"61 XL black cartridges), and am very satisfied with my purchase. Works like new at a small fraction of the cost in my HP 2510 series printer. I recommend this product and I myself will be ordering all my ink from this seller from now on. So if you're considering buying this product but aren't sure, look no further, you can't beat the price, and I can vouch for the quality. Great product...happy buyer. (Real buyer by the way, and this is an uncompensated, unbiased review, from someone who has far too much else to do, to waste my time falsifying a review.)
3105398
No other brand really works as well with the HP printer so I stick with HP products.  This is the best price I've found on the high volume cartridges and they work great.
4386746
These cartridges work perfectly in my HP Photosmart 7515 printer. I have never had a problem and have been using them and reordering for the past 2 years. It's the only brand I'll buy and it is very reasonable compared to the HP cartridges.
1346330
Great ink cartridge. Lasts long time. Price is reasonable. The XL means it's an extra large cartridge that stores more ink. It's easy to change on my cannon maxfly printer
3498066
Great printer. Always liked laserJets from HP. Simple, don't have problems and expense of color cartridges that leak their ink into the printer and permanently damage the printer.( HP is not helping you with that). So better off with black and white.
1504410
All the advantages of a NEW (not a refilled) cartridge.  Clean printing and 100% reliable.  And I strongly recommend this XL version.  The standard  245 cartridge seem to go empty pretty quickly.  I didn't count pages but I'm pretty sure this XL lasted well over twice as long.  I've switched to XL's only.
3521911
Save money, by ordering new HP cartridges.
One of these worked, the other didn't and there is NO magic over-ride button as the vendor stated.

~Jabba