voracious
adj
1 very greedy in eating; ravenous 贪吃的; 极饿的
a voracious eater 贪吃的人
a voracious appetite, hunger 极大的胃口、 极饿.
2 (fig 比喻) very eager for knowledge, information, etc (对知识、 信息等)渴求的
a voracious reader 求知欲强的读者
voracious seekers after truth 如饥似渴探求真理的人.
I suggest that we ask users of this machine what they think about it. We can photograph them using it too. Then we can put their comments at the top of the advertisement in big print. We can bring in some humour too. People enjoy reading humorous ads.