Bests & Worsts Reviews from Amazon

We have two of these in the bedroom with my 10 month old twins. We use them for every nap and all night. I liked that they plug in rather than use batteries. We always use them on the highest setting. However, yesterday our most recently purchased one (June '18) wouldn't turn on in the highest setting. The lowest setting still works, but that's too quiet to drown out street noise and the noise of each sibling. Night wakes were awful last night! I'm reluctant to buy another because I'm afraid of the same thing inexplicably happening again. We will need something else though, so the research process is starting all over again for me.