QTR-Quadtone RIP

I just purchased an Epson R2400 to replace the 1270, which has been  
dedicated to B&W printing with MIS UT2 inks and QuadToneRIP  for a  
couple of years. Since I needed to do an operating system overhaul  
anyway, I took the opportunity to reinstall everything from scratch  
which means I now have *only* the Epson R2400 software and profiles  
installed. I'm standardizing on Epson Heavyweight Matte and Enhanced  
Matte for general printing with this printer (likely one higher-grade  
paper as well: perhaps one of the Hahnemuehle or Moab papers, or  
Epson Velvet Fine Art), and I print a lot of B&W work.

What I'm interested to know from others who have gone to this  
printer: How much of an advantage have you seen from use of QTR over  
the Epson driver for B&W printing? So far, my tests on the Epson  
Enhanced Matte paper have proven to show very good quality. I'm just  
unsure as to how much additional benefit would be had from going to  
QTR at this point ... It is a godsend for getting decent B&W out of  
the 1270.

Godfrey