I can only speak for the AD900, never even seen the others in person.
The AD900 is very detailed and easily driven. It has a forward midrange which works nice for guitar work and vocals. It has a big soundstage and an airy sound. It is more trebley than your average headphone and might be too bright for some. Bass is deep and tight but light on impact, definitely below average in terms of bass quantity. They are light and built well. I find them to be comfortable because they rest lightly on my head and ears but the earpads are thin so this means that the driver housing actually touches your ears kinda like an over the ear headphone. Some people hate this and there are mods like the phat pad mod to fix this.
Contrary to what was said above, I don't think the bass is rolled off at all but just low in quantity so it doesn't always sound present.
What kind of music do you listen to? I pretty much listen only to alternative rock (punk, metal, indie, folk, alt country) and only thing they might be considered bad for is metal. I don't mind them because their speed works well for the genre and the forward midrange is great but the lack of bass could easily be a big turn off for some.