These cans are easy to handle and a rugged pair of headphones. They sound similar to HD280-Pro, but with slightly less emphasis on the bass. They can, like the 280s, be a bit warm to wear during extended listening sessions, but the ear pads can easily be replaced by velour pads, which come as an accessory.
I usually switch between the HD25 SP and the HD 280 Pro, and I am constantly discovering similarities and differences between the two.
These cans require a lot of time playing in before they open up, unlike the HD 280 Pro. They can sound a bit harsh right out of the box.
They are easy to stuff in a suitcase, since the earpieces fold up flat. The headband cannot be folded, though.
They are very rugged, despite their appearance, and deliver a very good sonic response. These phones are especially good at rendering voices accurately, but lack a bit of the top frequency range, but if you're into vocal jazz, like myself, that has not such a great impact on the overall impression.
The bass response could be a little better. I've listened to the big brother HD25, and they do have better bass response, but at a price almost twice as high, the price difference does not correlate to the sonic improvement.
As with all supraural headphones, they need some time to get used to wearing, since they are applying pressure to the ears. At 85 ohms, they may need an amp to sound at its best, but I've listened to them on a small MP3 player, driven by one AAA battery!
In conclusion, a very recommendable set of headphones.