I had TWD Pro two times. I love hard games, i currently have IM, ACDC and BSD, so i think to know what i'm talking about.
TWD is hard and really frustrating, too much for me. I think it's the hardest pin i had, and it's more annoying than fun most of the time. It's really satisfying when you have a good game. Better when you make adjustments to make it easier. In stock settings it's just horrible.