I've been thinking about this cross for a long time now, I've already got a half decent lurcher and I'm more than happy with my terrier so hopefully I'll end up with something in between the two of them!
Where I mainly walk I think one of these pups will do me fine, like you say they might be a bit slow catching a rabbit flat out in a field but they should make good ferreting and mooching dogs, just need to try make my mind up what one I'm keeping now!