Digital BW, The Print

I'm just looking for user opinions on the Cone 6 ink sets for the 2200.

How are they for clogging, refusing to give a clean nozzle check?  I
sometime go for 2 weeks to a month w/o printing so I need to know how
they fare just sitting in the printer.

Print quality?  Are most using the QTR?  

Any reason to NOT try them and stay with UT7?  

Thanks

Neil