We are satisfied with our windows. Although priced higher, they are from a technical standpoint a solid window system.
As a former NASA engineer, I was disappointed in the inability of our sales rep to answer some technical questions I had, although as someone with an advanced degree in aerospace engineering, it was way above his pay grade. I have discovered the light infraction to be about .0014 degrees less than what I'd like, but it's satisfactory. The glass should be about .011308 millimeters thicker, but it does the job. As far as the seal itself, I am not certain it will withstand a drop in barometric pressure that would take it below K301.89 degree Celsius, but that would indicate extreme weather conditions.
The vinyl extrusion framing, while below the 8.314 Panometer reading I would have liked, seems to hold up well. All in all, we are pleased with the windows.
Product or Service Mentioned: Window.
Reason of review: Good quality.