I have one - it completely replaces the ink tanks, which is why it won't work on HPs and the like where the print head is an integral part of the cartridge.

They aren't particularly pretty to look at, because the supply tanks are on top of the printer with plastic tubes going to where the ink tanks used to be (so to speak).

However, if you do a lot of printing it's the way to go - you won't get the heads clogging up because you've run out of ink and kept going, which dries up residual ink in the nozzles, and it's far cheaper in the long term.

Don't believe the rubbish people tell you about the quality of ink - the equipment suppliers usually use the same ink supplier...!

The people I use are DG Films in Heywood, Lancs (UK). George is very helpful and knowledgeable. Although I always go to his warehouse in person (not far from here), he can be found on eBay. So far he hasn't found the need to set up a website, as he mostly supplies retailers and computer fairs.

George sells Epson printers, too - you can buy one with a continuous ink supply system, and he'll refund you the cartridges you don't need!