I've used mk3s for the past three years and have only just tried the mk1, definitely prefer it. What don't you like about it?
its just unreliable matey, collars break if ferret even looks at water, struggle to get them fixed these days aswell, i also like the search feature on the mk3 saves you walking round or crawling round like a tit waving your arm i have used both an i think i have just got used to mk3 now , makes my life a lot easier i hated having to crawl around under hawthorn hedges but now i got a fair idea as to where the dig is gonna be before i even use locate hope