If you've spent any real time behind a desk, you know the feeling: that dull ache that creeps into your lower back around hour four, no matter how many times you shift in your seat. I've dealt with that discomfort for years — the price of a job that keeps me in front of a screen for most of the day. So when the Musso X700 GlideTrack Ergonomic Office Chair landed on my radar, I was more skeptical than excited. I've tried "ergonomic" chairs before that were really just a firm cushion and a marketing budget. This one is different, and after weeks of daily use, I'm ready to explain why.