We bought 26 All Ultrex Marvin casement windows five years ago. The first year we had numerous water leaks due to poor weather strip installation.
But Marvin warranty came out promptly, no argument, they replaced all of the weather stripping on all of the windows and since then they have been perfect. We had huge rainstorms last year with 50 mph winds... not a drop of water leaked in anywhere. What impressed me the most was their promptness in responding to our call and their frankness in recognizing that it was their weatherstripping that did not get installed correctly that was the problem.
I love these windows! They look good, they work perfectly, no complaints.
Review about: Marvin Windows And Doors Integrity Window.
Reason of review: Reliable warranty.