Hey mate, the working dog world is full of best dogs in the world and owners..... especially the lurcher scene...
Just walk out with them, you know if someones genuine or a complete waste of space...but give credit were credits due if there animals are up to scratch, most will bull every dog up they own, its called blinkers nod your head and agree its less hassle ...
The only thing you need to be concerned about is are you happy with the dog, thats all that counts...