Pros: -Really good sound. Even without the amp on or the Sensation55s running the sound is good. It's clear and has nice separation of instruments as far as I can tell. Pleasant to listen to, and very clear and crisp. Not muddled.
-When the amp is on and the Sensation55s are running, the bass is utterly fantastic. It doesn't feel forced or fake. They seem to essentially be pressure/vibration speakers (Unsealed diaphram) behind the main drivers.
-REMOVABLE CORD. Huge plus. The slot is a little small so you do need thin-end cords, but if you have a cable eating pet like me it's a godsend.

Cons: -Biggest con is the amp auto-off is very overzealous. There is an adjustment slider on the left earpiece that lets you change how intense the sensation55s run. This is needed as some music has well...better lows/bass than others? The problem is the amp to power them auto-offs to save battery power. This wouldn't be a problem, but it auto-offs while music is playing if the volume is insufficient or the music doesn't have powerful enough bass in it. This results in the sensation55s turning off and loosing that wonderful bass punch it has when listening at lower volumes (which I consider normal listening volume).

Other Thoughts: A very darn good pair of headphones. They'd be great if the amp could be forced on with a switch so that even at lower volumes the sensation55s would be running. Regardless they're keepers. Even without those, they're really good.

Do note that these things pump really heavy bass. Be careful with high bass music as you CAN get a pressure headache from them if you say...have a friend that takes "Hey my headphones have good bass" as a challenge.

Pros: Bass. Sound quality is out standing. Price is modest. Now for the best part. It will run with a dead battery!!! There so comfortable I have fellen asleep multiple times using these. I can go on and on... I'll save you the trouble... Buy a pair you won't be disappointed!

Cons: Only one con no hard carrying case. But this does not have any thing to do about the headset itself so...

Other Thoughts: More color options maybe. Really happy with my buy.