Dan's Data Review: Sennheiser PX 100, PX 200 and PXC 250 portable headphones: "The PX 100 is not just the clear winner among these three, but a great product in objective terms too. Quite cheap, good sounding, insensitive to ear shape, and it folds up in the same nifty way as the other two. Without a good earpad-to-ear seal, there's just no comparison between the bass response of the PX 200 and that of the PX 100. And even with a good seal, the PX 200 still isn't better."
The PX 100 gets a Highly Recommended from me."