Well it does work.  There are bugs being killed.  But if you expect this to sit off in the corner of your yard while you sit on the deck but free, don't buy it.  I purchased a cheap dusk to dawn plug in sensor for it and let it go to work.  I have heard the gasps of friends when they found out I bought this.  People seem to have had many bad experiences with bug zappers but so far this has worked very well and doesn't make much of a mess.