geoffwnz:

 

Found the downside of the automatic one (Raid I think I was using) was the significant mess around it.  On any sort of hard floor there was a patch of residue which was very slippery.  The ceiling above it has had the paint dissolved.  Plastic trim on a fridge started dissolving from when I had it sitting on top of that.  And when I accidentally pointed it at a painted wall, the paint on that started dissolving also.

 

Otherwise seemed fairly effective at significantly reducing the insect incursion.  Way fewer flies, no more ant incursions and the spiders seemed relatively unaffected.  Though smacking whitetails with something solid seems to deter them from living. 

 

Ditto to this. I made the mistake of turning the contraption around the wrong way, pointed towards the wall and leaving it on over a period of weeks, and when I finally noticed, there was a large, soggy area of peeled paint in the lounge.

In terms of getting rid of flies, a strip of fly paper from the $2 shop hanging from our vaulted ceiling works wonders - after a couple of weeks, the thing is more fly than paper. Rather disgusting, but living next to a farm means it is rather unavoidable.