I use Sennheiser HD 518s and they're the most comfortable headphones I've ever worn. I wear glasses and these things don't push the frames into my temples like other models I've tried. I can and...
I use Sennheiser HD 518s and they're the most comfortable headphones I've ever worn. I wear glasses and these things don't push the frames into my temples like other models I've tried. I can and do wear them for several hours in a row, it's like a pair of pillows around my ears. I know you didn't specify you were looking for comfort but imo that's a very important feature, especially if you plan on using them for longer periods.
I wouldn't call them portable. They don't fold but they're a reasonable size. Each cup is about the size of a toilet paper roll (I am writing this on the john so that's my closest source of reference, lol). If you carry a backpack or a handbag they should fit in there nicely. You might be able to wear them around your neck if you're like me, but you might also think, "gosh, I look like a tool with these big headphones around my neck."
The sound quality is, well, quality, especially for the price. I listen to a lot of different genres and they have a fairly balanced sound that plays everything well. They're open-ear which gives music a bit of a "live" quality like it's coming from a live source as opposed to the sound-producing chambers you currently have on your skull. It's subtle, but noticeable if you try swapping them out with a closed-ear pair. The downside to open-ear cans is that there is some bleed so people nearby can hear it if you have them turned up. This is also not great if you record music and monitor yourself while playing; the mic might be able to pick up the sound coming through your headphones. Again, this is only a problem if you turn them up high enough.
I'm going a bit long here so I'll wrap up by saying that I've had this pair for 6 years and had to have them repaired once because someone set a bunch of heavy stuff (at least 20 pounds) on top of them and broke them. If you don't do that, they'll last a while. So yeah, they're not portable but the build quality is solid, they're comfortable for long periods, and the sound is excellent for the $100 range. If you don't feel comfortable buying used, check out the HD 579s. They're apparently 50% off on Amazon right now which puts them at almost exactly $100, which is a hell of a deal. I haven't used them but they're in the same line as the 518 and they look to be similar in build and sound quality.
I use Sennheiser HD 518s and they're the most comfortable headphones I've ever worn. I wear glasses and these things don't push the frames into my temples like other models I've tried. I can and do wear them for several hours in a row, it's like a pair of pillows around my ears. I know you didn't specify you were looking for comfort but imo that's a very important feature, especially if you plan on using them for longer periods.
I wouldn't call them portable. They don't fold but they're a reasonable size. Each cup is about the size of a toilet paper roll (I am writing this on the john so that's my closest source of reference, lol). If you carry a backpack or a handbag they should fit in there nicely. You might be able to wear them around your neck if you're like me, but you might also think, "gosh, I look like a tool with these big headphones around my neck."
The sound quality is, well, quality, especially for the price. I listen to a lot of different genres and they have a fairly balanced sound that plays everything well. They're open-ear which gives music a bit of a "live" quality like it's coming from a live source as opposed to the sound-producing chambers you currently have on your skull. It's subtle, but noticeable if you try swapping them out with a closed-ear pair. The downside to open-ear cans is that there is some bleed so people nearby can hear it if you have them turned up. This is also not great if you record music and monitor yourself while playing; the mic might be able to pick up the sound coming through your headphones. Again, this is only a problem if you turn them up high enough.
I'm going a bit long here so I'll wrap up by saying that I've had this pair for 6 years and had to have them repaired once because someone set a bunch of heavy stuff (at least 20 pounds) on top of them and broke them. If you don't do that, they'll last a while. So yeah, they're not portable but the build quality is solid, they're comfortable for long periods, and the sound is excellent for the $100 range. If you don't feel comfortable buying used, check out the HD 579s. They're apparently 50% off on Amazon right now which puts them at almost exactly $100, which is a hell of a deal. I haven't used them but they're in the same line as the 518 and they look to be similar in build and sound quality.