Depends what suits you, some people will say it's a must have, but for me I don't need frozen goods in the fridge very often. On the odd occasion that I do need it, like bring home a fridge full of prawns from Mallacoota, we just freeze the prawns in the deep freeze before we leave then on the morning we leave run the fridge down to minus 5 and whack the prawns in. Even 5 or 6 hours later when we get home they are still frozen with the fridge swinging between -5 and -1, providing the fridge doesn't get opened too often on the way home. Being the home trip of course we also don;t have a need for beer and milk type stuff to be in the fridge so being below 0 isn't a huge issue for us.