I was surprised to find this on discoverdoublebass.com. Its a video so you can see them in action:
Double Bass Stool Review
My orchestra has the middle seat: very heavy, squeaky, and I hate motorcycle thrones: uncomfortable (for me) and the point of the seat butts into the back of the bass restricting where I can rest it.
Mostly I'd like to add a heavy guy warning about the Vestil, along with the "be very careful where you put your fingers" already mentioned. There is no way that chair can regularly support the 250 pounds Lemur and Gollihur spec it at, let alone the 300 pounds on the Vestil site. I've owned two of these now. The first one I used regularly when I weighed 206. Worked fine for a year or so but then the rear legs, where they hinge to the frame, fatigued, gradually bent and then failed entirely. Still I liked the chair so I bought a second one. Full disclosure, I was up to about 220 for the next one (I yo yo a lot). It didn't even wait a week. This time the two narrow beams underneath the seat which extend back to the rubber frame contact arms bent sideways, leaving the seat lopsided. I scavenged the seat from the first chair only to find those seat supports had similarly bent, only not as much. So if you're reasonably light and sit squarely on the seat all the time, you'll probably be okay. Me, I use it with my telescope for stargazing, where the lightness and the easy up and down make it handy as I move from one target to another. But no way would I trust it at a concert, unless I could get back down to college weight.
Gollihur sells a big brother to the Vestil with fixed adjustment heights which felt more solid and comfortable. It's pricier though and the height adjustments were a little too far apart for my liking.
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I did buy the Ikea but ended up donating it. Too tall. And maybe at my age and weight I'm over cautious, but it felt flimsy to me.
Nowadays I use a pneumatic adjustable stool meant for wood working at bench height. It's not as light as the Vestil and the rotating seat isn't ideal for bass, but it was on sale for $40, and even came in concert black! A year in and it's holding up fine. Being able to lift a lever and instantly park your butt at any height while you're holding the bass is great...at least as long as the seals hold up. I am slightly dreading the day when I'm playing a concert and with a sigh the cylinder gives out and I slowly sink down to low rider height.
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If I could justify the $700 I'd go for this one, either the 5 or 4 leg version:
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A teacher of mine had one. Comfortable, rock solid yet extremely light. So light, I wouldn't care that it doesn't fold. Maybe in another life.