I got my cats from a breeder - one was an ex queen and the other a returned kitten. They had been indoor/run cats for about 3 years.

I decided that I would let them out as our environment is fairly safe (no outside environment is totally safe unless a run or cat-proofed garden). They both have taken to indoor/outdoor like ducks to water.

Both have become avid hunters (not what I would have wanted but that is a cat's nature). I make sure that they are kept in from dusk to dawn and I have trained them to come to banging a fork against a steel dish - sound probably carries further than my voice.