Has anybody used those ink cartridge refill kits... the kind where you use a syringe to inject ink into the cartridge you already have? I've been printing a lot of graphics lately, which has been draining my color cartridge big time. Rather than plunking down $50 for a new cartridge, it would be nice to spend only $20 on the cheap ink cartridge kit and get multiple refills. That is, of course, unless the refill kit is crap. Anybody have any feedback on whether those kits are really a good bargain, or are they junk?