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Marvin Integrity is a wood ultrex window and the Infinity is all ultrex. Ultrex is their pultruded fiberglass. I have discussed this with a number of people in the industry and the consensus is that in the next decade pultruded fiberglass will be THE window material. Just like boats, wood is nice but the maintenance eventually kills you. Vinyl oxidizes and cracks. Putting in aluminum coating on the outside is a little better but aluminum and wood have very different expansion rates due to temperature. Wood, vinyl, aluminum all have very different expansion rates than glass but pultruded fiberglass and glass are very close to the same. Right now Marvin has the best deal I have found on FG windows.
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