ya know i've really never thought about if DS has a poly count indicator so i'm sorry i wouldn't know atm. may have to explore that issue lol.  normally i don't use the sub-d function unless i have a really good close up that i need any of the characters to be uber smooth since most of my images have them at at least 10' distance from the camera and a whole scene around them. 

 

there are more shall we say tech savvy users of DS here in rendo but if you ask over in the DAZ3d.com forums they have more specific of an answer