Purchase windows for my whole house approximately 10 years ago and had seal failure on a couple of the windows. Hometech's service tech came out when promised and replaced the glass. Apparently at the time of purchase the glass was purchased locally and they have now switched the glass supplier to Cardinal in the states which has a 99.9% rate against seal failures. I would not hesitate to recommend Hometech Window to my family and friends or if I move and need windows I would use them again. Very happy with product, service tech and customer service.