I recently purchased Renzo sliding window product and installed in my home. Overall, I am highly impressed with the quality and performance of your windows. Firstly, I must commend the smooth sliding mechanism of the windows. They operate effortlessly, allowing for easy opening and closing without any sticking or resistance. The noise reduction capabilities of the windows are remarkable. While I am thoroughly satisfied with the product. I will gladly recommend Alcom System Windows to others seeking high-quality and reliable windows.