vicissitude
n
(usu pl 通常作复数) (fml 文) change in one's circumstances,esp for the worse (个人境况的)改变, (尤指)变坏
battlingagainst the vicissitudes of life 在每况愈下的生活中奋斗.
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.