Secret lab chair cushion

Hey y’all, was planning on buying a secret lab chair soon, but had one question for those who own one. I was wondering if overtime the chair cushion will flatten like other generic gaming chairs. That is my only worry I have buying one, don’t want the cushion where you sit to flatten like other chairs. I work an office job so would be sitting in it for 6-10 hours a day. All the reviews I’ve seen feel like they were paid to say that lol. One last question, do the armrests overtime begin to become lose or shake? So if anyone has this chair for sometime, or just at all please let me how it is and your thoughts. Buy mainly id like to know how long it’ll last. Thanks in advance