Well, I bought the one-piece unit. I have had it for about a month now. I think I have used it enough to voice my opinion.
Pros:
It is cheaper than the alternative.
It is much lighter than the orignal T-Tops.
It was pretty easy to install.
For the most part it fit well.
Cons:
It squeeks a bit on the center bar. The plastic tabs fit in to the slots for the T-Tops and they squeek a bit. Maybe with some wear that will go away.
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The edges don't conform (exactly) with the line of the pillar. They corners stick out a bit. I am hoping that, as the weatherstripping seats itself, I can tighten them up and pull them in a bit.
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The tinting is much lighter than the tinting on my T-Tops. If the sun is high, it's almost like having the T-Tops off with no breeze. Could be a plus in some instances.
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Bottom line. For me they work. I bought the storage bag but have not used it yet. I have not tried to store it behind the seats yet. No leaks. For a savings of $600, I can live with the shortcomings