I like this stool. I got the 17 inch one. Sets up in seconds. Folds and packs in seconds too. It's super light weight. A lot of online gear reviewers rave about the Helinox chairs, but this one weighs less and sets up easier. Sync was the lowest price I could find online for this stool anywhere.
I do have a complaint both about the chair and the manufacturer support. I had an issue with one of the legs the popped out of the sleeve when I was extending it (be careful not to extend them fast). I could not get it to stay in after it popped out. I reached out to support with the manufacturer, Hillsound, on chat and also through email. The Hillsound chat person tried to explain how to fix it, but wasn't very helpful. He told me to contact the support help by email. I did. Waited almost a full day and haven't heard back from the manufacturer.
I figured out how to get the leg back into the sleeve now. There are 2 plastic buttons, one on each side of the leg, that need to be sticking out to catch in the sleeve. One side was stuck inside of the leg. I was able to pop it back out with a metal pick. I don't know if I would be able to do that in the field. It helps now that I know what I'm trying to do if one of the legs pops out again. I'm worried that the fact that it has popped out once may make that leg more inclined to pop out like that again. We'll see.
I want to add that I made a mistake in the original post here and said that I had contacted Sync. Their customer support reached out to me within minutes to ask when I had communicated with them because they didn't have a record (and how could they help me). I looked back at my sent emails and realized my error, that I had contacted the manufacturer, not Sync support. Sync customer support has been fantastic and very quick to respond, so super props to them. They went the extra mile, so I circled back a third time to add this note.