If you need a chair for 7+ hours per day then you need one that was designed for it. Try out a Herman Miller chair at your local John Lewis if possible - I got one refurbished for about 25% of cost price (which was over a grand). Everything fully adjustable and extremely comfortable. You don't need to worry about quality control on these chairs either, just buy and forget about it. Should last you 20 years or more.
Ultimately, like most things, you get what you pay for. I'm sure these bucket style seats are fine for a quick hour on COD but longer sessions you will need something a bit better.