NBS Line Conditioners any good?

So I'm in a position to, ahem, inherit some NBS line conditioners and was wondering what people think of them. I can't seem to find model information on the NBS website, but they're the black boxes on their products page, I believe. So how do they stack up to say, the Richard Gray Power Company's 600S/Pole Pig, or the 1200 Custom?

Also, anyone see the statement on their website about their new speakers:

"NBS Electronics has its listening studios in Minneapolis, MN. We will fly you one-way to Minneapolis and accommodate you in a 4 star hotel for your listening evaluation. If you commit to purchase we will fly you home."

Is that for real? So, if you don't buy a pair then you don't get to go home?