If you need quick acoustic patches in your home studio without thinning your wallet too much, this is the thing for you.
I bought myself a few of these for my bedroom, stick some on the wall and hang some on dedicated, cheap mic stands. The sound is significantly better than before.
I couldn't find any foam, that would be cheaper than this for such a big surface, yet still quality enough. Though, if you are building a real studio, you might consider spending a little extra on the foam, as this doesn't even have it's own packaging, and might just come a little damaged. It won't affect the sound protection, but won't look as pretty.