Looks great!
I've had a mirrored back on my 48-gallon aquarium for decades and have recommended it as a background. I also have a bubble wall in front of my background in the middle and it softens the illusion. I've had many tetras and other fish attracted to their reflection. Rummy-nose tetras would swim back and forth across the back of the tank. And it lets you have twice as many fish as your tank can hold! Sometimes, it looks like I have 16 cories! It also allows you to aquascape the tank differently, as you can see behind everything.
Taking photos is a problem for me. You get room lights or yourself in the reflection, or if you use the flash you get a burst of light.
I think it is the best type of background you can have!