We loved this product. My kids were amazed at how many "germs" were left on their hands even after their normal handwashing routine. They were anxious to wash better to see if they could get rid of all the germs. Since we used this kit I have noticed them washing their hands much better and using anti-bacterial hand gel more frequently after blowing their noses and sneezing. The kit was easy to use and the little ultra-violet keychain light was sufficient for viewing the germs. The kids are anxious to take the kit to family get-togethers to show their aunts, uncles, and cousins how dirty their hands are and to teach them how to properly wash their hands to get rid of the germs. I highly recommend this product for families. I would probably recommend the larger kit if you have a classroom of students as you would get a sturdier light, but the keychain light is okay for smaller groups.