Just installed one this evening. Goodbye replacement ink cartridges!
[url]http://www.printonadime.com[/url] (through EBay) is where I bought it...took ~1 hour to install. Cleared out the excess ink in the cartridges that still had some in them, and they are now trash :D
Good to consider if you're sick of paying through the roof for ink on these things, and then when it "runs out" there's still technically a fair amount of ink in them (I pulled out 2.5mL on a black that was "out", which is about 20% full still).
Cost of replacement cartridges in retail store: $80-$100 Cost of replacement cartridges online: $30-$50
Cost of unit w/ink: ~$80 (good for 4-6 full rounds) Replacement ink: ~$60 (good for 4 full rounds)
Tidbit for the day.