Got my PL-200 in yesterday. I unfortunately suffered the same fate as others, as I hooked it up and no sound. Having read Mike's comment on the board, I pulled the amp and sure enough the connections to the woofer had fallen off. It was a pretty quick and easy fix, and it's working fine now. So, thanks to Mike for saving me a lot of trouble in having to return the sub!
I did want to mention a word of warning to anyone else who is going to "try this at home". To do this fix, you need to remove the amp from the enclosure. The amp has capacitors on it, including one fairly big one, and capacitors store electricity. Also, they tend to hold a residual charge for a while even after you've unplugged the unit from the wall. So, if any of what I just said is news to you, please be sure to Google capacitors before you try anything, so that you can first get a better understanding of what they are, how they work, what they look like, and why it can be hazardous to your health to touch them.
BTW, after about an hour of listening, I would say the PL-200 is fairly comparable to my Definitive Technology ProSub 200TL. It's stronger and more robust in some areas, and a bit weaker in other areas, particularly at higher frequencies (close to the 80hz crossover point I have set). I'm going to give it a couple of weeks in my primary listening room to break it in, and then do an A/B comparison to determine which sub stays in the primary room and which one moves to the secondary room. I'm hoping that once the break-in period is over, its upper bass deficiencies (relative to my DefTech) will have cleared up.