I had bought these things years ago when they first came out and they had a recall because they would get really hot and there was a fire hazard.I was not happy as my son was a baby at the time and I did not want to worry about a fire.
I never did get my refund back for the "6" I bought. So again, due to I did not want to use chemicals around my child and pet I decided to try the all new version. Yeah right! It was the exact same thing.
I certainly hope they fixed the problem with the fire hazard.
Good luck to anyone buying them.