Harman Kardon has recently made a big push into the headphone space with a number of new models, including the Classic (or CL for short), a set that retails for $199.95 and may be the best of the bunch.
This is an on-ear model that has a very distinct design, with a modern take on an old-school double headband and square earcups that harken back a little to the Bowers & Wilkins
I personally don't have a very big head (at least I didn't think so), so I went with the default Small band. The headphones were fairly comfortable but didn't feel great, especially over longer listening sessions, so I looked at the instructions and swapped in the XL band. It definitely made a significant difference. And while I can't say these are the most comfortable headphones I've tried, they're comfy. Just not supercomfy. Of course, comfort level varies from head to head, but a couple of editors I passed them off to for a test run felt similarly.
It's worth noting that they did create a tight seal on my ears and managed to shut out a lot of ambient noise. In other words, while this isn't an active noise-cancellation model, the Classic does passively block out a good amount of sound, and it doesn't leak sound either.
As far as extra features go, you get an Apple-friendly inline remote and microphone. With Apple iOS devices (iPhone, iPad, iPod), you can use the Classic as a headset for making calls. Call quality was good in my test calls. Using the inline remote, you can raise and lower volume, skip tracks forward and back, and pause/play your music. Those features will be more miss than hit for non-Apple smartphones, so take that into consideration if you're an Android user (the microphone and some of the remote features may work with certain Android models, but they aren't supported and don't usually work).
The headphones don't fold up, but they do fold flat -- and by flat, I mean really flat. While the included carrying case is fairly large in terms of height and width, since the headphones fold so flat there isn't much depth to the package. It stows away nicely in a laptop bag or backpack, or potentially your suitcase.
The headphones have a detachable cable, which is nice, though you do have to detach that cable to get the headphones to fit properly in the case. Luckily, the headphones' designers have been thoughtful enough to include an interior pocket in the case for storing that cable.
Overall, I really liked the sound of these headphones. I tend to like well-balanced, "accurate" headphones, and the Classic fits that profile, with detailed sound and bass that's plump and pleasant but not overreaching. For closed-back headphones, the sound feels open and not canned at all. There's a bit of restraint in the treble, so you're not going to get that edgier detail of "faster," more aggressive headphones that push the treble harder. I wouldn't call these laid-back, but they're fairly warm and I tried them out with a variety of music and came away feeling that they were quite versatile. That said, if you're someone who wants headphones that can deliver a more thumping bass, the Classic may not quite satisfy you.
At $199.95, the Harman Kardon Classic headphones are fairly pricey. But when you combine their impressive fit and finish and sound quality, they actually seem fairly reasonably priced compared with the competition. I compared this model with the $199.99
For those considering Harman Kardon's step-up Bluetooth Wireless Over-Ear Headphones ($249.95), alas, I haven't tried them yet, but I'd venture to guess that the Classic earphones sound better. And despite my small quibbles about their comfort level, I have no problem recommending them.