No cord noise on these cx300o, but my older cx500 did. Make sure you buy it from a reputable dealer as I've heard rumors of knock offs that do have cord noise. I love mine. Comfortable and sound great!
CX150 has been dead for a long time. Its replacement was the CX200, I prefer the CX300 of course. They just go up in quality and price. CX200 is the cheapo model and the CX400 is the reasonably expensive one. They have a lot more that just increase in price and quality. I prefer the CX300 because they are sub $50 and are great. The CX400 is ok, kinda overpriced for what they are, really just nicer looking CX300s. They with a holder, case, and a bunch of other stuff,