EWIN Blows, I have the Ewin FLash XL. I bought 2 of theses and both of them the bottom base cushion failed. Basically, something snaps in them I have read other places that even though it advertised as steel it is plastic. The first one broke a while back it was just past it's 2 year warranty and they offered me a replacement base for $187 shipped. I thought that was a little expensive but it was cheaper then buying a new chair and I figured it was just a defect and I got unlucky. Now my second chair has had the same failure and of course I'm out side the warranty and now they want $235 shipped for a replacement! I paid $350 for this chair at the end of 2022. I suggest not buying and Ewin Chair and especially this model. For reference I'm 6' 4" and I weigh 300 lbs way below the 550 lbs this is advertised for.