NOTE: To give justice on headphones, you should always compare them with products are in the same price range and target audience, not with audiophile-grade headphones like the HD800s.
It is very hard to review these headphones as they are in the middle of the pack. It is a step toward the right direction for Koss to rename this headphone as "TBSE1" or Tony Bennett Signature Edition 1, since they are better fit for studio reproduction than for DJing.
Value: Again, at the $100 price range there are better options such as the Philips CitiScape Downtowns, the Grados, WS55s, but for what the package offers, it is pretty good. First, you have a hard-carrying case which I don't see at any $100 headphone, removable coiled cables, machined-aluminum ear cups, 17 digital music downloads, and musical legend Tony Bennett's signature etched on the headband and both cups.
Audio Quality: Here's where a lot of argument will rise. When Koss released this headphone before with the name DJ100 people complained that it is lacking punch from its bass. I would have agreed with them, but when you are DJing you are really not concerned about the lower bass range, but the mid bass range, it is where you do your beat counts. So this headphone may not be particularly good for general consumers, but for professionals they will do their job.
Lows: Bass response is very accurate, good for music reproduction, but may not sit well for general consumers. Its bass doesn't go deep, but the mid bass is very accurate and will give you enough punch.
Mids: Is the selling point of these cans at $100 there's no better cans that produces a better vocal reproduction. The Grados are also very good with the mids, but they are too forward. The mids produced by the TBSE1s are not fatiguing in any manner.
Highs: Slightly rolled off, but present. They are papery sound into it. Technically, they do not exceed in the low and highs category, but when you mix them with the mids they are very easy to listen to. So what good are these headphones? Musicality and pacing, very good.
We audiophiles have always been too technically which is a strong point and also a weakness. Some forgotten the importance of music. And, this headphone gives you that beautiful natural melody. If you want to escape the techno-babble of the world and relax somewhere else, this is the headphone that will do it for you.
Design: This is one of the better designed headphones around. The cups are machined aluminum, hinges are aluminum built too. Tony Bennett's signature is embedded on the headband, not just printed like any other headphones. One downside to this headphone is they should've used a better material for the ear pads. I guess what's lacking with this headphone is the craftsmanship. It needs more precision, but not an issue with me they are very tough and durable.
Comfort: While I hear some complaints regarding its fit, I have no complaints for it. Maybe if you have a humongous head that's your problem. For me, the headband has a good fit, they aren't clampy compared to the M50s or the PRO700MK2s. My ears fit the ear pads, even though I have bigger than average ears.
Overall: There are better options if you want a more neutral headphone, a bassy headphone, a DJ headphone, a monitoring headphone for the $100-$150 price range. But, if you want very good mids this headphone is worth looking.
Update: With the PRO700MK2s' pads the Koss TBSEs' sound improved. The bass got tighter and punchier, more prominent. The soundstage got wider and the imaging improved more. Koss TBSEs' ear cups are the standard 90mm which will fit any DJ over-ear headphone.