Neon screwdrivers seem to get a lot of bad comments and there seems to be a lot of urban myths and legends surrounding these tools, much of which cannot be backed up with facts!
For many people a neon screwdriver is a cheap and easy way of making a quick test to see if something is live before you attempt to work on it.
Obviously a GS38 approved voltage tester is better in some circumstances, but the GS38 approved testers do have major problems as the tips are so well shielded that you often cannot make contact with the terminals.
The neon screwdrivers in this video were bought here- http://fave.co/1PixDK6
The neon screwdriver with continuity test was bought here- http://fave.co/1PixW7P