I previously had one of those gaming racing chairs and i'm a big guy and to say i was in alot of pain after years of sitting that chair is an understatement, Once i got this char though it has changed my long days in front of my computer immensely I don't get pain in my lower back anymore, I still do have some pain in my neck and shoulders but i'm still fine tuning the chair with the lumbar support and headrest so i'm sure that's resolve itself over time and fine tuning.
The only negative i have is not even related to the chair or the company but the courier, I live in a granny flat behind a house but they wouldn't bring it down the drive way to my house they only leave on the verandah of the front house which is not even where i live so i had to move this massive 50kg box by hand by myself (the courier had a Trolley) down the driveway and when i say massive i mean this box is almost 1 square metre in dimensions.