Mirror or no mirrors on wardrobe doors?

What are your thoughts on mirrors on wardrobe/built-in's doors in kids'/guest bedrooms? Yay or nay?

Thank you all for your comments. I think I will need to weigh up the following:

Pros

• Kids/guests will be able to check their outfits
• Will make rooms apear brighter with light bouncing around
• Will make rooms appear bigger (although with our 5m x 3.5m bedrooms I don't think this will be an issue)

Cons

• People waking up in the morning/middle of the night and scaring themselves.
• High maintenance (fingerprints & dust show easily)
• Could they possibly make our 5m long rooms appear way too long (robes will be along the 3.5m long walls)

B