In my family we use Instant Ink and actually love it. We're on the largest plan (300 pages/mo). We spend less on ink now than we used to, and it is a huge relief to not have to make a late-night run to the big box store because the school project is due the next day and the stupid magenta has run out. The ink is always there, waiting to be swapped out, then you recycle the used cartridges when they're done. It's incredibly convenient for us, is a cost-savings, and I am reasonably okay with the fact that they know how many pages I print and the types of documents.

HOWEVER, I was recently looking at the bandwidth stats from my network switch, and was pretty shocked to see the printer has sent out several hundred megabytes of data back to HP over the past month. I knew it had to communicate with the mothership so they could charge me for my usage, but that should be a packet that says something like "User XYZ just printed 7 pages," which would reasonably be 5kb per job. I have no idea why hundreds of megs of data need to go out, and so I'm planning of on doing some DPI investigation the to set what on the world it feels like it needs to be sending.