Various companies seem to take bookings and then use a central company to provide the jeeps and guides. What you get on the day is therefore going to be the same whoever you book with, we chose Go Etna because out of 5 companies we emailed in advance of our holiday, they were the first to reply and only one of 3 to do so! There are half and full day trips, we chose the full day trip. The jeep picked us up from the hotel exactly on time and we had a very informative trip with some great off-roading experience as well! Full day trip includes lunch which was plentiful and included some local wine as well.