Digital BW, The Print

I am looking for people's personal experiences using Roy Harrington's 
QTRgui RIP with Piezo K7 cartridges and one, the other, or both 
printers. I am interested in any problems such as banding, clogging, 
paper feeding problems, etc. I am wondering how these two printers 
stack up. I have a R2400 which I am dedicated to colour and printer 
using K3 inks and ABW.

Also, any suggestions on where to buy one refurbished or cheap would be 
appreciated.

Thank you.

Paul