I can't comment on the 4480, but I have the Photosmart 4180 - it's about 18 months old.
Comments on the 4180? On the whole, it's fine. It's been reliable and produces good images. For printing photos I don't bother with the extra photo ink cartridge - I'm very happy with what I get from just the black and tricolour.
Scanning is pretty good. Just be careful about the default sharpening setting that the scanning software is set to. I find it that it tends to oversharpen, resulting sometimes in a rather hard, edgy image. But it's easy enough to reduce that setting.
Ink costs aren't cheap, but they're probably no higher than I have experience with other makes of inkjet.
One final tip - if the 4480 is anything like my 4180, keep an eye on the left-hand sliding paper guide. It has habit of slipping loose rather too easily and allowing the paper to feed a bit crooked. It just needs checking regularly.