Digital BW, The Print

I'm curious about what the trade-offs are between using
QuadToneRIP and OPM/IJC ?   Looks like Windows users are out of
luck on either one, and for Mac users, QTR is OSX only and
IJC is OS9 only.

But, except for that ? (Specififically, for 2200 users).

Looks like both are very flexible, and will be able to use
any quad- or hex-tone inksets that become available for the 
UltraChrome printers. Speaking of which, when will those
actually become available (for those of us who don't want to mess
with CIS or filling our own cartridges) ?

Thanks, John