I've only ever seen one Whippet work, belonged to a pal of mine. It was working the lamp after the first 6 or 7 rabbits I was getting bored. Credit where it's due that dog could shift and put a shift in, but after watching it time after time taking rabbits without putting a bend in them it got a bit monotonous and predictable, but if its numbers you're after I guess they the tool for a quick job. Me personally I like to see a dog work put a bend or two in use its gears etc, that feck thing was like a .222 spot and grab.
That's the only experience I have of seeing 1 work, I guess they are