They can be very beautiful and give a lush effect for realistic tank set ups. I've seen them in malawi tanks and they look amazing in larger tanks. But they would probably take up a lot of width from smaller tanks.
Okay, I got the 3D background yesterday. It took forever to put in since I already have an established tank. The fish kept wanting to go behind the background, the snail kept getting in the way, gravel was hard to keep piled out the way, etc. --- ANYWAY ---
Overall, worked out pretty well. I could have cut it better around where the filter is placed so it looks less obvious.......but it doesn't look too bad. If I ever do it again, I know for next time.