All of those chairs have weight limits. The closer you are to the weight limit, the shorter their life is. The "big people" chairs have larger diameter tubing and better plastic joints. I'm at 270ish, I won't buy any chain rated at under 400 lbs. Those 300lbs chairs only last me a year or two.

They also need to be sitting level and have all 4 legs flat on the ground. Most of the motion chairs have very low weight limits. If it says its rated at 250lbs, you better believe that means no more then 250lbs, and if its moving, add 50lbs or more to your weight. We bought a pair of those swing chairs rated at 350lbs. Mine failed the 1st time I used it. The one my wife uses is pretty iffy, and she is under 150lbs, she hasn't used it much at all lately. Those absolutely need to sit level with all the "feet" flat on the ground. Don't believe the ads that say they work on unlevel ground.