It seems a lot bigger than it actually is in the window, so don't be intimidated by the 40".
The LED panels needed to be realigned but it was a very easy fix.
The software that you get you will have to play with for a little bit to get it down but once you do it's fairly straightforward.
The only issue that we experienced was the mounts.
The mounting hooks lock into a channel and if you make them too tight they will pop out of that channel.
But other than that this is a fantastic item!