I have had one of these for a year, and I love it.
It has a USB port to connect to my PC, and it is small enough to sit next to my normal printer on my desk. It takes up the same amount of space as my telephone. But the beauty of it is that you do not need the computer to print out pictures from the camera if you have a Kodak compatible camera as there is the dock that sits on top. If you have the right rechargeable battery the dock will act as battery charger too. Of course you can also put photos on a memory stick and put that in the USB to print from.
The Kodak paper stores away neatly underneath although the tray is a bit fiddly to clip in place for printing, it is a neat storage solution. The ink for it is integral so when you buy a pack of 50 sheets of paper you get a cartridge which prints exactly 50 sheets of paper. Run out of paper, change the cartridge. That works well as you always buy paper and cartridge in a pack, so I don't have the problems I sometimes have with my ordinary printer where the inks run out at different times, so you get funny coloured pictures if one ink has gone.
Pics are professional quality and you can crop, rotate, remove red eye and alter picture size all using this dock, so again, no need to upload and photoshop if you are basically happy with your photo but just want to tweak it. All this makes this such a quick and convenient item, I'm so glad I bought it.
The cost of the paper and ink cartridges means prints are not cheap at 30-35p each, but that compares well with going to a shop and of course, you get perfect results every time, you don't have to wait, or even leave the house.
It makes me print pictures instead of constantly just looking at them on screen - so now I have up--to-date photos of my loved ones in my wallet all the time! you can print 4 identical passport sized photos instead of 1 6x4 or two on one 6x4 sheet, so you have loads of flexibility.
The best thing is being able to take a picture of say, Granny with the kids, show her on the camera screen and then 2 minutes later give her the prints to take home of the ones she likes. Brilliant!