I ordered this unit and used it on my Lucky -Shitzu-Brichon Mix. After the first training excercise I thought he was ready and let him off the leash. He ran through the wireless fence - so I learned a lesson that he was not ready. I turned the correction up a notch and he has not left the area yet - awesome! No more worrying about him running in the road etc. I live on a slight incline probably 30 degrees from high to low side and it works well on the high and low sides without a problem. I installed it in the middle of the house away from the kitchen and appliances. I am sold - works great for Lucky.
Works Great! 
