I didn't mean to hijack the ops thread.
The pella windows I got were not builder grade - they were the pro-line, supposedly the same window as the designer line, but with less options, such as the encased blinds.
The warranty against wood rot is 20 years and my windows are now 23 years old.
Some googling shows that pella has a lot of complaints and even a class action law suit that paid out millions, but of course, I'm too late for that.
When I built, the builder gave me a choice between Anderson and Pella. I thought my dollar went a little further with Pella. I guess it's the same old "you get what you pay for"