Ive had my red brick box for a while now and its always been reliable for me until recently. The box still pinpoints the dog but on my last outing the depth was out a metre and the box would read 50m or so when the dog is travelling. As i said, its been a great locator but i think its on its way out. I dont have much experience of other locators other that the red brick, pieps and the grey knocker box. What do people prefer and what are the pros and cons of each as im in the market for a new box. E.g pieps, barryvox, bca tracker 2 or 3. Whats battery life like on them and are they robust, resi