Digital BW, The Print

I saw this company, Inkjetcarts, that makes compatible carts for the 
Epson R2400 and other printers here:

http://cgi.ebay.com/Spongeless-Refillable-Cartridges-Epson-
R2400_W0QQitemZ140118012749QQihZ004QQcategoryZ14303QQtcZphotoQQcmdZViewI
tem

Anybody have any experience with these carts, good, bad or indifferent?
The interesting feature that caught my eye was the little handles for 
the ink plugs. They look like they might be easier to use than the MIS 
tiny plugs that I've been using. It looks like they have the Image 
Specialists ink line up at good prices too. Anybody work with these 
carts before? Thanks
Lou