I have the mack-daddy craftsman set and I hate it. Over half of the times I have needed to use it, I couldnt because it either didnt have the diameter i needed and when it did it didnt have the thread pitch I needed.
Though it does work very well when i can use it. Depending on the frequency you will be using it I would look at harbor freight. Maybe check out some pawnshops? Im sure Mac and Snapon make good sets but thats major $$.