Looking for the best Siesta Chair for reading  

I am interested in buying a siesta chair by Ingmar Relling and am seeking advice on the best version for reading. They all look super comfortable, and I will use it to read and write on the computer. Any advice on what to look for? I see lots of them on the web and there seem to be many models. Some have only a canvas back and seat and some have wood slats. Did they change over time and is that why I am seeing different construction techniques and cushioning? Any experience or advice would be welcome. Thanks