I did have concerns originally but from what I remember it wasn't an issue if the glass is strengthened and when I looked closely mine had the symbol for it. It has been about 5 years now and I haven't had any problems with the glass.Thanks, have you had any concerns with the heat build up in the window? Seems to be mentioned in some reviews that it makes the glass very hot.
One thing I forgot to mention. It is great to have it in the summer when its really sunny, but it makes the rooms look a little dim in the winter months as it blocks out some of the natural light too.