Hornet3d
Wise
Yes, I change image too and adjust the sun position to match.
I love it!
Of course if I'm doing a render that need a transparent background, I use the hide features in properties leaving show in ray trace on.
I still get the lighting that way,
It is great to have that option and fine if you are adding a plain background in postwork. If it is an image to be used as a background then matching the light direction and colour make it more difficult although not impossible.