Pros: Bass response, separation, soundstage, isolation, build quality, accessories
Cons: Included cables are too long for non DJ portable use, some will want more treble air
Bass: it goes deep, rumbles, upper bass has punch, but doesn't get bloomy or bloated. It doesn't sound "too thick" which I would hate, so no problems there.
Mids: easy going and natural sounding, (far better than consumer efforts by sennheiser like the Momentum over ear in my opinion). Tonally quite accurate, but not as shimmery/sibilant as for example the Amperior.
Treble: inoffensive, smooth, polite, some people will want more treble air and texture.
If you stay within the world of DJ headphones the HD7 seems fairly natural to me. At least in their category. (brighter open headphones are a whole different story, thats where you will notice the differences the most, obviously). Those who are after a lighter sound and don't listen to EDM much and prefer a neutral bass but still want a closed can look at sets like the B&O H6.
Either way I doubt many would judge the HD7 DJ as too dark sounding, the Beats Pro for example sounds somewhat more uneven.
The soundstage on this headphone seems well defined on this headphone for me, the K267 for example takes a more integrated approach.
Build quality: mostly plastic with some metal reinforcement in the headband. Despite plastic components it feels very chunky and solid. Similar to the Audio-Technica ATH-M50X.
Comfort: better than on-ear DJ headphones like the HD25/Amperior, despite fairly high clamping force).
Accessories: spare velour pads, nice hard-shell but rather large carrying case, which I wouldn't use, I prefer those carrying pouches/bags.
Comparison with cans I own/owned: Despite being a 95ohm headphone it seems very efficient to me. On my phone and PC I only use about 1-2 notches more in volume than the 32ohm K267.
Compared to the AKG K267 Tiesto the HD7 DJ is more exciting in the bass, the dips in the response here and there give it a better sense of staging (or perhaps coupled with the ear cup housing design/driver tech).
Depending on vocalist one or the other has the edge to me in the naturalness of a voice, they can both sound beautiful, I would deny that they are overly genre specific, voices are clear and not lost underneath a pillow like on some other U shaped headphones. Overall they sound somewhat similar, with the Tiestos wanting to show a bit more of treble grain detail or splashyness on occasion.
So one is a bit more coherent, balanced sounding and musical while the other is tilted towards separation, and this embracing authorative powerful sound.
They are more alike to each other than the V-Moda M100 which has thicker bass, duller mids, and and almost spiky artificial sounding treble, over time I thought the sparkle could be annoying on it (despite it not being a bright headphone at all). The M100 sounds just right for me at higher volumes but the treble then gets in the way just a touch.
At the end of the day I think the HD7 DJ is superior to the V-Moda M100 in sound quality and comfort and especially isolation. (I mention it because you frequently see DJ's with V-MODA's) However much like the HD25 family they are a bit more of a "tool" , they don't have the style element of the Moda's with its customizable shields or the more compact design, and small carrying case.
An area where the HD7 falls short because it is so strictly targeted at Pro use is that it has overly long cables, which are a drag for portable use.
My bottom line is though that you can enjoy all sorts of music on the HD7 DJ, it is nowhere near as confused as some DJ styled consumer and pro cans.