Is any one familiar with Interstate True View 6300 or 6000 series windows?

After meeting with 6 contractors, we finally found someone we think will do a good job but he is recommending the Interstate True View windows. They look fine but so did every other window we looked at. After each contractor left, we looked up the window manufacturer that they were recommending and found that the window was junk.

I cant seem to find any information about the Interstate windows though.

Any thoughts?