Digital BW, The Print

There were a bunch of "digital B&W at PMA shootout" threads 
recently.  In one of them, I believe Paul mentioned that, although he 
had not done a direct comparison of the Piezo system to the UT 
system, he thought it likely that the Piezo prints might appear 
smoother in the highlights b/c it uses more light ink than the UT 
system.

(Stay with me here, I'm getting to the issue in the subject line)

As I understand it, one complaint users of ImagePrint have (other 
than cost) is "doti-ness" in the highlights.  I guess my question is 
this: should we expect similar perceived dotiness in the highlights 
using the UT7 inkset (when it becomes available) as people complain 
about with ImagePrint?  And if so, what would be the advantage of 
this dedicated B&W inkset over IP?  (Yes, IP costs a lot, but that 
cost differential disappears when you take into account that you have 
to buy a separate printer for B&W to use any grayscale inkset).  Both 
can print on glossy or matte; both can tone B&W; both can produce 
neutral B&W prints.

So: if (and I said "if", so correct this assumption if it's wrong, 
please) a print using UT7 would have a silimar appearance in the 
highlights to one using IP, are there other advantages that would 
make UT7 better as compared to IP?  E.g., depth of blacks?  
Smoothness of midtones?  Longevity?  Ease of use? Anything else?