I think the idea of a second sun-roof is kinda cool. The Land Rover's have them and it brings a neat 'safari' look/feel the the vehicle.
I would imagine the incision and opening is made such that it avoids the structural components of the roof support system...so it should still be quite safe.
As for warranty, many sunroofs are installed by factory aurthorized places, and those place almost certainly warrant their work. If they made bad stuff and didn't stand behind it, the dealership would cease using them. When we went to buy my wife her Yukon XL, the salesman insisted that the after-market sunroof was far superior to the factory unit. Let's NOT discuss that issue, just suffice it to say after-market can be done quite professionally and within parameters of the warranty.
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