The new Crusher wireless from Skullcandy is a great improvement on the old Skullcrushers. The most noticeable improvement is NO EXTERNAL BATTERIES which is very important because a person can spend hundreds of dollars in AA batteries in a years worth span for the old Skullcrushers. Another noticeable improvement is the power efficiency in the Sensation55 drivers, I don't know if anyone noticed but they are more sensitive with a lower resistance (15 ohms i believe) which deliver some heavy powerful bass at maximum power. The REX40 drivers are better tuned, so it doesn't sound so high pitched and whiny as the old crushers. When using the Bluetooth capability, I can play most games real time with little to no latency, and if the batteries die I don't need to replace them I can put them on the charger and wait, but if its important I can also use the wire that came with the headphones and the bass feature will still work. The only thing that bugs me is the warmth of the headphones ear pads when worn too long, they make it uncomfortable and sweaty when listening for long periods of time ESPECIALLY while working out, but they work as amazing earmuffs in the winter as well as headphones.