Excellent product, top quality. Installers did an amazing job even though it was installed in January. Arrived at time stated, the job took close to 8 hours. Evaluated where the all the rot and mildew was coming from, did all the repairs, especially on the outside. Everything was picked up, cleaned, couldn't tell they were even there, except for a brand new window! We are very impressed and happy with the results. Will definitely go with Comfort King again for our replacement window or door, and recommend to everyone.