We had Windows on Washington (WoW) install a new sliding glass door and could not be happier with the end result and even the process.
Knowing you are likely going to do a lot of research, get multiple cost estimates and then drink heavy amounts of your favorite 'helper' when you finally realize the cost, here is some insight that might make things go more smoothly for you.
You may find lower cost estimates; however, you will not find another company that treats your home like it was theirs and have this quality of product to offer. From the initial visit by someone to take measurements, the office staff, and the install team, I quickly knew we had the right company.
Everything about this door is exceptional - highly recommend getting the integrated blinds. It does not open as far as my previous (contractor grade) door but that is a very, very small footnote. Joon and his install crew were absolutely amazing in every way; truly courteous and professional in every way.
As for COVID-19 concerns, there was a short (couple weeks) delay in getting the door delivered but that was fully expected. The install team wore gloves and masks and also laid a tarp on the floor from the entry into the house to the work location. Overall it took about 3-ish hours to complete everything.
It is still too early to tell any difference for warmth or sound but I am sure that will not be an issue. There is no question as to why WoW has such an amazing reputation. Thanks again for helping use to complete this long-awaited upgrade to our home.