Yes, it is the official website. The brand itself is legitimate too, offering many good quality gaming products at affordable prices. You will find lots of different chair models and chair add-ons, desks, keyboards, mice, gaming surfaces, and much more.
The company was founded in China where the products are manufactured. It has had a strong base in the United States since 2015. These are legitimate and competitive products, not cheap generic items you’d find on Wish, for example.
They generally get good overall reviews and provide free shipping sitewide for US customers. They also regularly run deals and discounts, allowing you to get money off your orders. Because of this, it is always best to purchase GTRacing products directly from GTracing.com and not third-party retailers.