This is a bit of a tangent, but hopefully related enough ...
If you buy a protective storage cover for your targa top, look closely before ordering. I was very disappointed when I found my new cover left the vulnerable corners exposed. It's easy to set the top down on one of the corners and chip it. The cover doesn't protect them at all (see lower corners in this photo).
Also, I agree with Marty. My glass top came with a cracked corner, and I stupidly did a few track days with my car and the top developed more cracks. I shouldv'e swapped to my other top for those days.
My cracks are hidden (not very well) with black vinyl (like the decal material). It looks okay from 15' away.