Bass traps, especially good ones are something you don't really value until you install them and hear the difference they make. While these units aren't a do all end all solution by themselves, when combined with other acoustic treatment options they work very well and will improve the sound of any room.
The price was very fair and they work as good as the competitors products. These are a little more compact in width than the Auralex units. I have both types but these ended up fitting one particular corner in my live room where the Auralex units wouldn't quite fit.
The foam is made well and they are easy to hang. I used Auralex FoamTak for these but other options will work just as well. If your using a different adhesive you need to try a small amount of it on your foam in a inconspicuous spot first. Some adhesives will eat the foam so be careful! The Auralex FoamTak won't eat it and is good to go.
I will definitely be buying more of these in the future as I expand my personal studio!