I have had a great experience with GIK. The professionalism and guidance is of the highest order and they offer a range of products to fit most budgets and design aesthetic.
I agree with @jastralfu, @kofibaffour and @ervikingo. Before spending any $ on any product, learn what your room is doing and needs. Download REW (it’s free) and get a Dayton OmniMic or similar product. They are not expensive and can often be found used.
Take measurements with the mic at the listening position and send the MDAT file, your room dimensions, and images of your speaker and listening location to GIK. They will analyze the information and make recommendations. Then you can decide what you can afford, and whether you purchase from them or another vendor or go DIY.
I can tell you that having REW data was eye opening. Speaker and listening positioning have a huge impact on what you hear in the room, and even how room treatments are positioned (angled, stacked, corner, middle, etc.) affects the results you get. I measured every change I made and was stunned to see, and then hear, the differences (good and bad) small changes can make. Good luck!