Ok then,
first box was a grey deben and the 16 ft collar, worked well but the depth was always a bit hit and miss especially once the wheel lost its numbers, it eventually drowned !
second box was the barryvox opto 3000 and an ortovox collar, works well once the dog is in one place but is a bit slow on the update when there's a bit of a scuffle going on
so can give a few odd readings but with a little patience it actually does what it is supposed to
The we got the B&F kit, the new rechargeable collar is fair way in front of the old one and i am a real fan of this kit, albeit the slidy