I think Koeman brings the best blend. He's not perfect, but neither was Pellegrini or De Boer or Emery. Each had their good points and their bad points.
With Koeman, we are getting stability. That's the first step that needs to be taken before progressing. He'll get us back to the upper echelons of the prem which is where we need to firstly be. The next year or two will be transition, but upwards (hopefully). Only the top, top managers have a consistent success rate, others seem to have their heydays, I think we are getting Koeman at the beginning of his. He is definitely upwardly mobile in his managerial career, and we now have a manager close to the finished article, as opposed to Martinez and Moyes who we got at the starting points of their careers.
Onwards and upwards. Start of something good I hope.