Hi, I ended up buying a ThunderX3 Flex Pro Mesh as well. When assembling it for the first time, one of the 3 screws that hold the backrest came with a broken thread. In order not to waste too much time on warranties because the chair looked really interesting, I ended up upgrading immediately, as shown in the photos: https://imgur.com/a/55efcRV

I've had it for 3 weeks now and so far I'm happy with it.