I have a StrongLite Ergo-Pro Chair. Designed for the Professional Massage Therapist. It has wheels so it can roll behind you for easy mobility or a handle to carry it. Pretty light-weight (weighs 19lbs)and easy to set up. Came with a flat and angled sternum pad.
Whichever chair someone buys I would say the most important feature to spend extra money on is to look for a chair that does not have a cross/support bar right at the groin area. My first chair had that and it was the biggest complaint from my testers so I returned it and got the Strong-Lite. I have had it for over 3 years and it still looks brand-new. Very Sturdy, working weight is 600lbs.