Purchased this gas range oven from Wayfair and in less than one year of use, the gas safety valve from the oven failed leaving a HEAVY gas smell each time we used the oven. Stopped using it, and it has been over ONE month dealing with Cosmo's Customer Service, still no resolution and we have an unsafe appliance at home. They never answer a call, all you get is an email every few days but never a solution. 
We contacted Wayfair hoping they would have some leverage connecting with their customer service, they also were unable to connect with  Cosmo's Customer Service and as amazing company Wayfair is, they sent us a replacing unit as soon as possible.  
I will be a Wayfair customer for life, but never buy a Cosmo appliance again.