Well, Imogene, I've used and installed the Designer & Architect series' Pella windows and think very highly of them. I've not used their Proline, so not up on them, nor their replacement window line.
Overall, Pella is a very reputable manufacturer with high standards & I've had good relations with them in terms of customer care & knowledge of their products, so my experience has been good.
You can find out a lot about Pella & their lines of doors/windows @ www.pella.com
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