I've owned this chair only a couple of months now, and I use it 5 days a week since I am working from home.  I can't get the tilt lock to work, though the seat height adjustment is working.  It looks very nice in my home office and is comfortable enough (not super great comfortable, but it isn't an expensive chair).   I gave it only 3 stars because the fabric is beginning to pill and the chair is beginning to look shabby.  The chair is way too new to be looking old and tired already.  I'm very disappointed with this.