Have been using iPad based EFBs for the better part of 10 years now. Before that we had an aircraft based windows system that had to be updated by the crew once a week. The update was centralized and scripted from a thumb drive issued to each pilot and could take up to 25 minutes, so if one started it at the wrong time, it could really mean major delay. The iPads on the other hand do need independent updates between apps, but that is usually just a few seconds, the only exception being LIDO if one was off for a few weeks, so best done at home or in the hotel during downtime.