We have heard similar experiences with spyder headlights with different applications. Even OE lights can have similar issues. A lot of current Porsche's and C6 Corvette's etc can have similar issues.
The factory coating may fail with or without protecting the surface. Though the film will tend to hold things together longer than if nothing were there. Keep in mind though if the oe coating fails and when the film is removed down the road the adhesive will pull off any loose areas.
As for alternative headlights, sorry don't have any other suggestions.