ZAPPERS - Who has had experience?

Can anyone who uses a zapper tell me what your experience has been - differences you've seen/felt using it. If it has been a positive and genuine experience, can you tell me where you got the zapper. This is new to me and it seems very hokey, but I'm keeping an open mind to the fact that a small gadget will make such a difference. Please leave as much input as possible. Thank you. Tweet