my granddaughter loves her password journal mainly because she has a password, not knowing you can get into it. the invisible ink is a great idea .she uses the storage area for extra pens and notes she has already written. the little light is great for use in car.
This item works well and is very fun for my daughter. The one issue we found was that it is difficult to duplicate a longer password. Stick with a short one and you will be fine.
My daughter, age 6, loves this journal. But I wish it had a volume knob on it, because it is really loud. And make sure your child doesn't say the password in a funny voice when they first record it, because then it's hard to get the password right later.