This is the most popular route to walk into the Everest Region, that said it is much less popular than the fly in approach so that even in the high season you will likely only run into a handful of trekkers per day. It is a very strenuous approach despite not reaching the high altitudes found above Namche. Since the trail runs west to east perpendicular to the valleys nearly every day the trail decends to a valley crosses a river then climbs to a pass only to decend yet again. This trek will whip you into shape and you will be well aclimatized by the time you reach Namche. While the views are not stunning it does give the trekker a taste of the middle hills and the villages are culturally more interesting than the "lodge towns" further up. There is something satisfing about going all the way to Everest Base camp with out getting into an airplane and following the route of the early expiditions, however in my opinion if you are at all limited in time I would advise flying in spending your time further up exploring the other high valleys like Gokyo, Chukhung and the Bhote Valley.