The 380HDs are the higher end closed back sibling to the 280HD.
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Pro Great sound quality
The 380HD is noted by many to have a flat response with good balance between lows, mids, and highs.
Pro Big ear cups
The 380s sit well over your ears and do not typically touch them when positioned correctly. This helps make them comfortable as the clamping force is distributed over a wide area, not directly on your ears.
Pro Very small amount of leakage
The tight clamp on the 380HD helps create a seal that prevents quite a bit of sound leakage.
Pro Blocks a lot of outside sounds
The large ear cups and the strong clamp allow for impressive passive noise cancellation.
Pro Can be driven to very high volumes by low-power amps
Con Very strong clamping force
The 380HDs have a very strong clamp. This helps the headphones achieve better sound isolation and minimal sound leak. Although some will find the clamp very uncomfortable. Fortunately there are also many who will never notice this at all and find the 380HDs very comfortable.