HP-78 cartridges do not refill satisfactorily.
919729
This product was totally incompatible with my printer.  I could not get my printer to recognize that i had installed a color ink cartridge. This is typical of other refilled cartridges that I have tried. There seems to be a problem with refilling this model of ink cartridge.
4949456
Cartridges worked well in my printer. However, I was surprised that I had to change them so frequently, until I realized, that they were only filled half-way! Not such a good deal after all, if you take that into account.
3132146
Next time, I will just refill the ink.

This item is expensive and does not really last reasonably.
2664809
I had a refilled cartridge in my printer to try it, and it was fine for a while, then it sat for a bit. My daughter needed to print something for school, and the printer didn't even know it was there. HP cartridges always work like a champ, they're just so gorram expensive...
3510764
I bought these cartridges thinking I was getting a good deal. Even if the cartridges weren't all the way full, I still could get decent life out of them. Unfortunately, this is not the case. Both the black and color cartridges were almost empty as soon as I put them in my printer. I have added screenshots that show the ink levels of the printer cartridges upon initial use. I've bought refurbed printer cartridges before but this is by far the worst I've ever had. All of my cartridges whether black or color have been about 10% full. That is frankly terrible. Some of the color cartridges have been empty as soon as I put them in my printer.
3631713
I am currently using these ink cartridges in my HP Photosmart C4580. The ink works just fine, but the cartridge doesn't always register with my printer. This results in the common "low ink" message you get with a lot of refurbished/refilled cartridges, which is not really a problem. What's annoying is that I have to reseat the cartridges to get the printer to accept them. I think this is just when I turn the printer all the way off, so maybe I can remedy the problem by never unplugging it. However, twice now I have had to spend extra time fussing with these cartridges just to get a page to print.
4786969
The cartridges fit my copier; however; they will not work properly with the machine.
2617060
Bought this to be able to re-fill.  Refilled it once, okay, second time wouldn't work.  Error message said I had to replace color cartridge, which I did and it still didn't work.
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
4316401
I don't think this cartridge is new as advertised, but rather refilled and put in the cartridge box.  My HP printer does not think it is a new cartridge and therefore will not reset the ink level and use this cartridge to print from.  Since I bought this well in advance of using up all my existing black cartridge, it is past the return date for Amazon by 2 weeks, so I am stuck with it.  Buyer beware!  I wish I could give it fewer stars.
4208550
Uses a very high rate of ink in all colors and black.  Cannot refill the cartidges because printer will not recognize refills.  Printer will not print 2 sided, always stops and says the paper feed is jammed.  Even with new color cartridges the printer will often fail the print quality until after 4 or 5 cleanings.  When the printer does work (about 50% of time) the quality seems OK.  When you don't use the printer for a few days the quality goes way down and machine must do another cleaning.....
4142134
I was looking for ink cartridges for an old printer. Ordered these refilled cartridges. Shipping was AWESOME, got it in a matter of days. However, my printer won't accept the refills. Prints like the ink is gone or dried up.

I would do business with this company again though...not their fault that my printer won't accept refills.
3170249
The Lexmark X5650 printer will still recognize the cartrdge as empty after refilling and can't be reset it to work.
3358955
I needed a portable printer for the road and I found one in the HP Deskjet 1000.  But, the ink is killing me!  I've already passed up the full amount I paid for the printer having to do 3 refills within 2 months.  As far as I know there is no copy count to keep track of output per cycle.  I'm going to count next cycle but in the mean time I've been looking around for options (self refilling etc.).
2496586
Color cartridge"78" did not function at all. HP printer cartridges would not align, which totally eliminated the copy function.
2151295
the cartridges work ok, but the first one lasted all of 1200 pages!  these are supposed to be hi capacity units.
3939861
I am a prospective buyer of a HP 7660 printer and after reading the reviews, I noticed that
most them were favorable, however I was concerned about the comments of Dr. Tug, who was disturbed that when he used a refilled cartridge, that he kept getting a warning of a
low ink level whenever he went to print a document. I checked this out with P.S. Ink of Northfield, NJ, who I have used for refills on my present (now defunct) printer and was told that there are work around solutions to the problem. Altho I do not have the complete details, one involves rotating 3 different cartridges.