I used the mark 1 for years but when the mark 3 come out I bought it, i used it once and hated it. It sounded daft and just didnt understand how to use it. It got left at home and it was forgotton about. The mark 1 come back out for me. It wasnt until a couple years later when I brought the mark 3 back out with me and this time I was determined to use it right. Picked up how to use it on youtube and now I will never go back to another. Its a great bit of kit. Finds the ferret in no time and you drop right on it everytime. Brilliant.