I ordered 2 of these chairs and they're so comfortable. The only issue I've had is the knob to lock them in place doesn't stay tight enough so the chair will still fall back. Also the tray could be a little sturdier. I don't leave my yeti cup in it as it always looks like its bending the plastic but smaller cups have been fine.
We still like them and plan on ordering 2 more so the kids quit trying to take ours. Lol