The Essentials is an all fiberglass constructed window.

Thanks. Yes, Essentials is all fiberglass. We don't like its appearance. And we need a slider--the Essentials slider is difficult to operate. Stiff and creaky. :(

Have you asked about the Infinity?

Oh thanks! I thought Infinity was just a discontinued name for the Ultrex window, but it looks like it's a separate line of replacement windows. This is a remodel--new larger window opening being cut. Will replacement windows work for that application?

Infinity handle looks exactly like the Essential handle that DH hates. But we are tired. If the sliding action decent, we could probably be happy with this window.

Kolbe has the Forgent. What style window, double hung, casement, etc? Intus makes a nice unit from all accounts.

Thanks! Need a slider window. I will try to get to Kolbe showroom. Not sure whether Intus is available here but I will investigate.

After several more hours spent on online research today, I've convinced my other half to just go with the Marvin Elevate. We can fully research all-fiberglass windows in a few years, when it's time to replace the windows in the rest of the house. Many thanks to both Windows on Washington and millworkman. I appreciate the help you gave me today and all the other wisdom I absorbed from past threads.