I went through the costco.com window program to put new windows in my house. The price was good, the installer prompt...but my windows immediately started leaking and have fought with costco.com for almost a year to resolve problem.
I found Costco.com to be horrible to work with, no accountability. They claim they are assigning you to an agent, but each time you call back to follow up--you start all over again as no one at costco.com claims to know anything about you or your claim.
Unless you have hours and hours to devote to holding any of these people accountable (installer, 3rd party "Trusted home services or costco.com)or you just enjoy being abused--I would not do it this way. Buy direct.
Monetary Loss: $16.