Pleasantly surprised!
Initially, I was skeptical that the 'catalyst' would stand up to the heat. After many years my old metal ember retainer had several large holes burned into it and was no longer effective in the open fireplace. I was looking for a replacement but could not find the correct sizes. I bought the catalyst in an attempt to cover the holes and prevent embers from falling through.
It has been absolutely great. The embers are retained and burn longer with more heat being dissipated into the room. The room is 24' x 17' and the addition of the 'catalyst' mat has had a major impact on the room's heat.
I would highly recommend this mat
Retains the wood embers
Increases heat output
No issues with airflow when lighting the fire
Wood burns longer
A little difficult to clean the residue ash from it as not all of the ash falls through after burning.