I have to say that I am thoroughly impressed with the Sure 846's. The highs are bright and airy, almost totally transparent. The middles are brilliant and OMFG the BASS on these is like my Martin Logan Dynamo 700 turned up to MAX. The bass hits hard and clean and the extension both high and low are magical. I honestly thought my XBA4's were supposed to be the end all beat all as they were lauded for their near perfect sound with healthy bass. They have absolutely nothing on the Sure 846! Music I listen to ALL the time sounds NEW again. I am picking up parts of tracks I have never heard. And in some of my dubstep tracks it feels like my whole head is in a perfect sub-woofer. I honestly feel it disturbs my equilibrium when it reaches down to the lowest of lows. I can actually hear artists BREATH in between words and phrases, stuff I have never heard before.
I am using them with the three flange in ear plugs. This design was suitable for me to rattle off shots with Ma Deuce, ask if you don't know who Ma Deuce is, so I felt this design would provide the best seal.
The seal is almost perfect and the sound isolation is superb. I can not hear my typing this short review on my notoriously loud mechanical keyboard. Because of the over ear design with memory wire there is little to no cable noise so I am very happy.
the bundled accessories are what you would expect for a $1,000 pair of headphones. You get a nice box, inside the box is another very nice box. Inside that very nice box is a pelican case and inside the case is your earphones, carrying case and a wide array of tips so you can get that o so perfect seal. it also comes with a second detachable cable 60 inches in length, they one already attaches is 42 inches.
Overall I would give them an 8/10. Why an 8 you ask? Honestly these should't cost as much as they did. I could see $499 but $999 is too much. I would send them back buy I already gave away my XBA 4's to my younger brother Dakota who is in his room going through his hip hop collection.
Pros-Perfect sound with head ratteling bass, almost no cable noise, accesories
Cons- prohibitably expensive, lack of customization