Its awesome and I live it but three times now we have had it where smoke has come out of the air vent at the back - this is due to a cold pocket in the chimney pipe and it not being driven out fast enough so being heavier it pushes the smoke back down which then comes into the room - its not pleasant and we need to know what You do to stop it happening - it only happens when dh light it 
. He goes into a blind panic and shouts a lot! Then we spray a lot of febreze and open the windows to let all the lovely cold air in.