tommy:
The DIs are remarkable for making all styles sound good. This is one of the first things you notice about them. Then there is the realistic dynamic range that enlivens the music and makes all sound "right there." They blossom naturally with the source and will only start distorting when you get way past normal levels.
Pop music is much less difficult to reproduce than is dense orchestral music. My system is now completely tuned and I can sit back and point out each orchestral section/soloist and assess their instrument's timbre. The soundstage is that good.
You do NOT need a sub with these if you tune them well (I use REW and JRiver). Your room will also impact bass response dramatically and some owners claim they need more bass. My larger room is very friendly to long waves and I have the DIs tuned down to 16hz with a little bumb upwards from 25 to 70cps.
Take it from me -- you will not be disappointed with these speakers.