I visited about ten different shops in the Louisville area that installed sunroofs and listened to their proposals. All but one wanted to replace the headliner. It was the liner ring as an option with the inalfa pop-up sunroof that greatly reduced the price and sold me.
The VX is a very airtight vehicle and the doors are hard to close with the windows up. I leave the pop-up sunroof on the slightly opened notch all the time (even in a light rain or snow) just to make it easier to close the doors. And, I like the extra ventilation w/o getting a blast in the face from the window.
Of course, if I'm parked in an unsecured area, all is locked down tight.