I started having back problems, and my therapist advised that I replace my mattress and any chairs I use to sit long periods of time. My back was in really bad shape. So I decided to get this chair for my home office. I'm 170 lbs, muscular build and a developer. So, I spend many hours at my desk. This chair fits the bill. The weight balance is really amazing. When I set the back all the way back and lay back all the way, the chair is amazingly sturdy. I mean, it may rock back, but, it is extremely secure. You can absolutely sleep in this chair. Oh, and pain in my back, all disappeared. This chair is amazing, You may be wondering why 4 stars. Well, in all its glory it does have some minor flaws. The head pillow could've been better designed, I am not fond of the elastic straps. Other than that, flawless. Additionally, the company service is also amazing. The arms are made of this soft cushiony plastic, also very comfortable.