Remember that with the cheaper color lasers you can expect to pay MORE for the refills than you did for the original printer
They are worth it if you are doing bulk, if not then stick with a cheap epsom inkjet (get one that has 4 or more ink carts in other words avoid if the color cartridge is a 3in1) and cheap cartridges (we've found that pro-jet are cheap and good quality)
---------- Post added at 13:52 ---------- Previous post was at 13:50 ----------
Watch out as well for chipped devices such as the Samsung from ebuyer, to use cheap refills you need to solder/chip the main board to reset the toner levels..
http://cgi.ebay.co.uk/4P-COLOR-TONER...item335cb73ea6