This is very hard to judge without trying one out. Are there any testimonials of people who have used this for 8 hours a day, 5 days a week? I need a new chai

This is very hard to judge without trying one out. Are there any testimonials of people who have used this for 8 hours a day, 5 days a week? I need a new chair and anything over £150 will be a serious decision for me.