I have considered them as I have a similar problem, but instead we are lucky that we can lock them under the house as we have a QLD'r. I did do a lot of research on them though. It seems that the wire system is very simple, really easy to use, its the collars that are the difference between the brands. we use Innotek for their barking and that works the best. They are a little more costly, but you get the quality, best bit being that each day the collar resets to the minimum level and increases until it stops the barking. I remember they had the best looking system/reviews for perimeters as well.
