Once I got them together I did notice a difference, but the first impression was very similar. I have a really hard time finding a pillow that doesnt make me wake up with headaches and neck pain that radiates. I had looked down and saw that the top two bands had come off seconds before it fell. HD600 is a little more detailed? But ER2 has at least 90% of details I heard on the hd600 at normal listening volume. False advertising! These sandals are great for a few minutes at a time, but I wouldnt want to walk around in them outside of a wet zone. Many reviews say they run narrow. Have loved Spider- Woman from day one in the 70s! It seems like the pockets are pretty roomy, so I can put a thick stack of copies in different pockets for different days of the week. The elderberry color is probably my favorite because it features gray with a light purple, which is perfect for me.