A little update on previous post. I have received the PX 200 from Sennheiser today, and can, without a doubt, shout: THESE HEADPHONES ARE AWESOME!!! (sorry about that, hehe)
But seriously, after having to fit them to my ears, which takes a bit of work the 1st time, and then having the bass break in, after now 3 hrs playing time, they are amazing on every level. The range is excellent, and even at full blast, no one but me can hear what I'm playing. Granted, I read a lot of good2reasonable reviews for the PX 100s, but if it's privacy and good enclosed sound you want, the PX 200s are the way to go! I'm in love! 😛