It's a great experience that I fully recommend for 1day trips from Milan. In 3h30min we were already in Courmayeur, thank to our super driver Lorenzo. Those 3h passed in a great atmosphere created by our guide Roberto, who shared with us interesting historical, geographical and cultural details about each region we passed. Going up was fast, Roberto organized everything smoothly and Monte Bianco intermediary and top views are magical. You have plenty of time to explore the surroundings an enjoy the terraces and restaurants with great views and traditional cuisine.