Van Den Hul power cords

Have seen at the website that they have 2 power cords, the Mainstream and Mainstream BS! The first is about 15mm thick and the other 12mm!
Would love to hear from anyone who has tried them or compared them to others!
Thanks in advance to all!
Haven't heard them, but Mainstream BS? I think the marketing department fell down a bit on this one.
I have two Mainsstream 15mm pc's in my system. They are exceptionally quiet, neutral/natural sounding cables. I've tried various others, but the Mainsstreams are by far the best suited to my system. It's a very good product.