I just installed my insert... it is a little smaller than I would prefer, but the one that was the next size up was $200 more and it was barely an inch longer and same height. 
The biggest issue is the reflective plate.... the rim is really noticeable. I read one customer who suggested coloring in the rim with a black marker... I will try that. 
The other thing... is the remote takes several presses to work... it may be the battery.... I would like to be more excited... as the flame itself looks realistic... and I really did not want to spend more than what I paid.... any suggestions on filling the space on the sides and masking the edges of the backplate (in case the marker does not work)? ... I also like the idea of placing my Alexa beside the fireplace and asking her to play fireplace sounds.... great idea.   I am not sure if I would recommend the product.