ORIGINAL: TFOX
Not stating that it can't be set up properly,but I have set up too many rest and no it isn't one of the easier ones.The easiest might be the old Golden Key Platinum.
One of my favorite rests, and what I put on my girlfriends target bow.
I had a similar rest like in your picture, but it was made by SME. Decent rest as far as design went, I liked it. It had some durablility issues though, I stripped a few screws out while adjusting it. I will be honest though, I set it up three or four times on different bows before it happened. And the one I had had a linkage system simular to the Muzzy Zero Effect.
From what I understand the new company that has it did a good job of fixing the few problems I had with it. I loved that arrow holder.
I was just at a local shop a little while ago and asked him if he sells a lot of WB rests. He said not really. It took some pushing, but he finally admited he didn't care for them much either, but he doesn't tell people that if they want one. He said pretty much what we have, they work but he thinks there are better rests.
Paul