With the hd25 it's easier for me to focus on vocals, and figure out the meaning.
Perfect to practice my ability to understand spoken english, when watching videos too.
I don't know for the bass hole, it's probably the best bass I've heard yet, I like it better than the bass of my senn IE7. The bass manage to provide some thump, without being bloated, which is a kind of performance.
Also I was quite happy to find the hd25-II 1 sold in my country (Morocco), usually I get stuff with the help of people that travel. I found the denon d5000 too, but it was sold at twice the price , let's say 1200$

. Same curse for the d2000. The hd800 was reasonably priced though, probably because no one will buy them there.