[midnightmonster]

For me, it's Linux support, ease of use, features, and economy.

When my little Samsung laser printer finally died, I bought an HP inkjet (OfficeJet Pro 8000 Wireless) for a bit over $100. I got home and took off all the tape, stuck in the large individual-color, separate-from-print-head ink tanks, plugged it in to power and my network, and printed the network settings page (which I turned out not to need). Then click-click-click on my Ubuntu system, and I was printing. Download driver click-click-click on my wife's macbook, and she was printing. One of the easiest setups I've ever done for network printing, and even easier on Linux than on Mac.

And it duplexes automatically.

My 6 year old is thrilled to be able to print in color, and I'm happy not smelling ozone.

So I'm happy with razors and razorblades inkjet, albeit with HP's most economical cartridges. (And there's a little part of me that is bothered by the lack of perfectly-sharp text printing that I've always missed when not using a laser.)

[metageek]

For me, the big one is paper handling. Every non-HP printer I've owned mangled paper; no HP printer ever has.