This set is really a must have if you have the Frozen castle. I don't regret getting this light setting for my latest Lego addition. However the big inconvenient concerns the instructions. I've never encounter such difficulty to understand instructions at Lightmybricks. Believe me I'm a big fan of this brand lighting system because I own the Taj Mahl, Boat in the bottle and the treehouse light sets.
Regarding this castle lighting set, my first comment is that it should have been better to change the background of the instructions to grey or another color than white. As the majority of the bricks of this set are white, it would be greatly appreciated to distinguish better the shape of the bricks from a non white background.
Regarding the installation experience, for the first time I struggled a lot in the understanding of the different steps.
As an example, the two cables that come out at each side of the left stairs. The manual doesn't specify which one of the USB port or the connector should go to which side. When you put the wrong side (which was my case), you have to disconnect again the left stairs.
Another example is the type of LEDs to put in the single Lego to light up the castle ice decorations. You only mention it's the "Cool White 30cm Bit Light" as opposed to "Cool White 30cm LARGE Bit Light", I didn't pay attention to the difference and was kind of forcing the large bit light to enter inside the single connecting point. It would have been considerate to…