There are no significant complications that might inconvenience the end-user. Though there may be occasional incidents when the adhesive or sealant does not adhere well, these reports are few and far between.
In the event where the user decides to remove the window film, there will not be any permanent stains on the glass surface and any adhesive marks can be easily removed with common cleaning agents. Complications are not likely to arise if post-installation instructions are adhered.