Hmm I recently ordered and bought the Polk PSW10 subs and I dont think theyre bad at all. I love it. However, I should note that this is a small room setup, it may not be good for gigantic living room or house. but regardless for my room, it's still loud and shakes the walls at full settings. It was the best sub I could find for $80.
But based on that picture, it looks different than my psw10. The grill/covering is not circular in mine, it's square and covers the entire subwoofer.