It's personal preference but I decided against it when I configured my P85D. Here are my thoughts:
- Extra weight, to the tune of several hundred lbs in the absolute worst place to add it. Coming from M series BMWs as my daily drivers, I just can't wrap my head around this - the car is heavy enough already. This by itself was enough to make me skip it.
- In a hot climate like exists in Texas, it is definitely going to allow more heat/UV into the interior. Sure you can add the screens but doesn't that defeat the point?
- Many people have reported squeaks, leaks, rattles, etc.
- In the cars that I've owned that had sunroofs (it's been years) I've never opened them.
- It makes the interior headliner look cheap - instead of one molded panel, it adds a fabric bar across the middle of the headliner and there are gaps where it joins the rest of the roof. The non-pano headliner is one nice solid panel.
- While it may make the interior more open for back seat passengers, the pano doesn't actually start in a way that makes it visible to the driver. It does, however, allow more light into the cabin - another negative in my book as it lessens the focus on the road ahead.
- While headroom is better in most places, the Pano actually reduces headroom at the front to back sides of the headliner.