I have the Samson SR850B. That’s a B&H exclusive model with blue headband wires instead of the black of the SR850C; it sells for $40 instead of the usual $50 for the version with black wires. They were my first taste of the big soundstage you get from open back headphones, and as such were a revelation.
On my head they’re reasonably comfortable. The ear cups are big enough to go over my ears rather than pressing on them and the clamping force is fine. They’re mostly plastic so they’re pleasantly light on the head. The ear cups aren’t well ventilated so your ears do get a bit warm after a while. They are a headphone for sitting still and listening to; trying to move around too much tends to shake them loose. Headphone fit is always an issue; nothing will work well on everybody’s head.
You do have to burn them in before they sound acceptable. Even after burn-in the high end is a bit loose; they don’t sound good on material with a lot of sibilance. (I have them on right now to remind myself of their sound.) Aside from that, the frequency response is pretty well balanced, including reasonably deep but not emphasized bass response. They’re easy to drive; you don’t need a headphone amp to get decent sound.
I have to dissent with the bad reviews here. These things aren’t giant killers, but they’re a good value at their selling price of $50 or less if they work on your head. I especially recommend them to people who haven’t taken the open back plunge and are looking for a cheap way to try it out.
My Monolith M570 has replaced the Samson for home listening when I want that open back sound. But I could see taking the Samson on a trip where I don’t want to carry the heavier and more expensive headphones. But not listening WHILE traveling because open back just isn’t good for that.