quaxo,
I just got some cheap ink for my HP 6500
I fear you are right.
The cheep carts leak and rewind my hardwood floor.
The HP carts never did that.
It's very popular here in Thailand for people to use tank systems or clone/refilled cartridges simply because of the cost of originals (they cost as much as they do in the US).
You wouldn't believe the number of times I've had printers brought to me that had the tank system's tubes leak or clogged print heads or leaking cartridges. And given the time and cost to repair these printers, it's often cheaper just to get a new one. It gets on the rollers, feeders, gears, everything. Without being disassembled and completely cleaned, it will never print right again. Like I said before, I'm not saying original ink will never cause clogs or issues, it's just less frequent.
For printers that have a single print head (part of the printer, not the cartridges), replacing the print head is very expensive. I had a Canon Pixma 3300. Paid $100 for it, new. Used and abused it for years. Finally, after about 4 years, the black section of the print head clogged. Tried everything to unclog it but no luck. The print head was easy to remove with the lift of a lever. Called Canon and asked if I could get a new print head somewhere, to which they said I could, but it would cost $75. The printer was promptly sold for $10 to a junk dealer and I bought an HP Advant K109a-z, which has the cartridges with print heads built into them, so if one gets clogged, toss the cartridge and get another. So far, it hasn't let me down.
I still wouldn't use clone/refilled cartridges with my HP though, even though the print head clogging wouldn't be an issue. Still have to deal with leaks and cheap ink. Anyway, I would advise anyone that while the printer is still under warranty to use original cartridges so it doesn't void the warranty when something
does go wrong.