Yes, I was the guy that's used it successfully on my Audi for lower control arm replacements. I've had to enlarge the opening on the forked end of the tool so it would fit around the tapered ball joint, but other than that it works quite well.
Grease up the threads well and also the bolt end that applies the pressure to the other half of the jaw and you should be good. I didn't lube the end of the forcing bolt, so it's mushroomed a bit but still works.
I apply tension with the tool and then one rap with a hammer on the steering knuckle and the ball joint pops right out.