Ours has been a godsend the past few nights. DD has a shocking cough (which Dr says doesn't need ABs :S ) and wasn't getting a proper sleep due to coughing all night.
Since we have had the vaporiser on she has been sleeping much better!!

I was lucky enough to not have to buy mine, my Mum gave me one she used for my brothers and it still works a treat! It's a Eukybear one and is about 12 yrs old!