I had to send it back, here’s why!
So yes, I had the Musso H80 Pro Ergonomic chair for 8 days of the 30 day free trial period, and it was enough for me to know that I couldn’t use it long-term. I spent about 60 hours over that 8 days, working, chilling out and relaxing in the chair, and that told me what I needed to know.