I have Marvin windows circa mid 90's that have completely deteriorated.They are true divided light windows with a type of vinyl/plastic over wood.
The bonding between the plastic material and wood has separated and allowed water to leak in over time rotting out the sills and frames. The only option is to completely replace all the windows in the house at 4 times the expense of the original installation. In contrast my neighbor installed similar Anderson windows which are as good as they day they went in.
Marvin has been of no help in rectifying the problem except to try and sell me new windows.I would look to other makers if considering Marvin.
Monetary Loss: $100.