I AM VERY HAPPY WITH MY UNIT.
It came in two shipments: fireplace insert and wooden mantle. Fireplace insert requires no assembly. Wooden mantle has to be assembled.
MANTLE:
The mantle is 11 pieces to put together but it was easy and took me 30 minutes. One of easier furniture items have I ever put together, BUT the L-joints are not exactly 90 degrees so making sure there are no gaps between boards that are perpendicular requires a little bit of adjustment  before tightening the screws...I was able to get it so there are no gaps. Very study when put together.
ELECTRIC FIREPLACE:
Beautiful. Great options: flame color, frame brightness, heater temp., timer 
You can control it on the unit or with a remote. 
Unit is very quiet when just the flame is on without the heater on. When heater is on, there is blower noise and it's louder than I would like, but not horrible. I will mostly use it with the heater off.

Shipment came quickly, in 2 deliveries, packed well and no damage.
I love it.