This is a nice app. Pros: Quickly create a flange to the size you want; It takes away the process of creating the sketch and then the solid bodies. The dimensions I took are right there. Cons: The bolting holes don't go all the way through the face of the flange. It could use an update. It is 2+ years old. The flanges are modeled to be slip on flanges and nothing else, but that can be easily fixed with a few sketch modifications. I don't have any more Pros or Cons as I just started using this app. Maybe after using it awhile I can/will update this review Overall this is a nice app!