Summary: I can't believe they are still selling this flawed machine. When they found it caused damage to print heads to print just black without all the color cartridges, they just disabled the function so customers have to keep buying color cartridges and it goes through the color cartridges like no printer...
Pros: Prints well, good print quality
Cons: Can't print in black ink only (must have ink in all color cartridges to work at all), Uses ink ridiculously fast. Ink is Expensive. You'll spend twice the price of this printer in two months on ink alone.
Summary: The 6100 works fine...when it works. Do some searching on the web and you'll find that this printer goes through color ink cartridges voraciously...even when you don't print in color. And it won't allow you to print in just black ink if any other color cartridges are empty.
Summary: Will never get another HP printer again because of this printer! It's loud and annoying, it takes ten minutes to warm up and calibrate it self so it can tell me that I need to replace my cyan cartridge so I can print a black and white document.
Summary: This printer never worked out the box. An IT pro and an EE PhD both did everything including downloading new drivers, firmware etc. It just prints blank. No ink comes out. It was replaced on warranty with another. Same thing. It won't even print the test page by itself.
I now have $200 worth of useless ink cartridges that don't fit anything else
15 August 2015
Summary: DO NOT BUY THIS PIECE OF JUNK!!!! One year later, it's broken. I now have $200 worth of useless ink cartridges that don't fit anything else. And their till 2am tech support does not exist! Not even at 3 pm weekdays.