The difference is huge. I only used one panel on the back wall, but I can already tell the sound imaging is way clearer in the front, just really clean and detailed. But since the ceiling and floor are still smooth, hard surfaces, the vertical echoes and reverb are pretty annoying. It's not a big deal when listening to music, but you notice it more when watching movies or gaming (especially now that the front and back echoes are gone, it really stands out). Installation was a breeze - just two wall hooks to hold it up, and the couch backrest supports the bottom. It's sturdy as hell. And if you're renting, no need to stress about installing it or moving out later. The only downside was the delivery took forever. I was going crazy waiting for it to show up.
The craftsmanship is top notch, but the light color panels can easily show marks, so make sure to wash your hands before installing!