It's fine if you can get it for the right price and don't have high expectations.
It's not bad if you can get it cheap enough. I have this in my office paired with a nice set of Emotiva B1's and it gives me just enough bottom end to be happy with it. I know I wanted a small 8" subwoofer for my office and this was the most cost effective option that fit the size I needed. I have large SVS subwoofers in my Home Theater and was not looking for anything like that... Again, if you just need something to fill the void in lower frequencies and not expecting something to shake your walls, this is a good option.