Totes love this stool/chair. I accidentally started a trend at work and at least 2 other people have had our company buy these for them. I bought this on my own because I'm a sociopath and I didn't know if I'd like it. 100 bucks seemed steep to me, personally -- definitely not even the batting of an eyelash at the office -- but I liked the sort of all-in design: it's a stool, it's adjustable, it wobbles, it's plastic, it's portable. My cubicle at work is taken up by a big Staples generic L-desk and usually I have at least 1 utility cart with a full system sitting on it that I'm testing, troubleshooting, or developing with. And since I'm at work, I also wanna not be too comfortable -- sociopath, remember -- so I don't want some ridiculously comfy chair because otherwise I'll just sink into it and get lazy. That's my worry, at least. So I had been using a plain box chair, like a modern design of just two cushions in a chair shape between two squares of wood. It worked, not too comfortable, but it couldn't spin, and my back is to the opening of my cubicle, so anytime someone came in to ask a question or talk or tell me something, I'd have to either not turn around, or turn over awkwardly in the chair. I'm 5'9"-5'10", and this is the perfect height for sitting at a desk or extending it up and having some support while semi-standing. I've got an adjustable sit-stand desk thing at work, and this works perfectly in either configuration. My favorite part is also that it lets me pick whatever awkward pose I want to contort my torso while I'm sitting and I can just lean the stool in whatever direction I want. The bottom is a solid hard plastic-y rubber, and has pretty substantial ridges. The seat cushion isn't much, but it's all vinyl and the triangular shape lets you pick whatever seat position you find comfortable. To raise and lower the seat, there are depressed buttons on every "corner" (the 3 triangle corners of the seat), so it doesn't matter how you pose the seat, you'll always have a button to reach with either hand. It's definitely sturdy enough to also just sit up straight and wrap my ankles around the post or rest my toes on the top of the base. So, you can balance, you can sit angled, and you can use it to be a little lazy at your "standing" desk. Also, my favorite part is that when it's depressed all the way down, it fits perfectly under my desk. Like I said, I don't have a lot of room in my cubicle, especially when coworkers come in to talk, so it's great to be able to just quickly scoot it under the desk out of the way, and we can talk and stand at my computer and no more awkward spinning my back halfway around to face people. Also, if I'm sitting on the stool, it's super easy to spin around and I just have to worry about my awkward corners and not the arms of a chair or the back or anything, so I don't have to worry about knocking stuff over or pulling on a dangling cable or cord or anything like that. Super convenient for engineers, developers, researchers, designers, anyone working at an adjustable desk who wants something kinda active, but doesn't wanna sit on a giant beach ball or something stupid like that. Also, since it's all plastic/vinyl, no worries about cleaning/dusting, super simple. And when it's depressed all the way down, despite being a bit heavy, I can certainly carry it no problem with one hand, and if I really wanted, I could easily bring it home in the front seat of my truck. I really appreciate the portability and practical functionality, and again, despite being a bit expensive at 100 bucks, it's well worth it, because it fits pretty much every situation I would want for it. Again, I'm a weirdo, so to me it's like "If you wanna relax, get a couch; if you wanna work, get a stool". I like spinning around, being able to change direction and lean and change height. It doesn't get in the way and it's heavy enough to stay stable and I haven't fallen down yet. Over, yes. I've fallen over, but not all the way down. Plus, I fall over almost every day, even just standing still, so it definitely isn't a result of the stool. Honestly, if I had a home with like an island or counter, I would totally get 3 or 4 of these instead of just a fixed stool, even without the back. If you're a little crafty/handy, I think you could add a back if you really really really wanted, but I just love the idea that these can be table height and counter height, all in one. Don't get too comfortable! Be ready for anything!