My HD25's arrived earlier and im very pleased with them. They do sound flatter than my PX100 and Grado SR60's but i feel its just right, certainly through my iPhone 4. Plenty of volume as well. I find my other cans boost the low end too much and this makes it harder to work out bassline from MP3's etc. The HD25 seems a lot cleaner.
The pair i briefly tried before had the Velour ear pads on them. These felt comfortable but im quite happy with the stock ones. I do feel the isolation is a bit better, as is the low end.
I did try the other pads but didnt feel i wanted to lose the low end kick, which i feel is perfect as it is.
I work with a large photocopier and its quite strange not hearing it churning away, i have to keep looking at the screen to make sure its not working. ive also been told off twice for not answering the phone in the print room lol.
So, skint but happy.