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I use the HD25's regularly for work, and they are rock solid. Sound is crisp and detailed. Some might like the sound of the HD280's better, but I find there is more detail in the 25's, and the low end is more controlled.
About rock solid, my HD25's have been mistreated in any possible way you can imagine, people stepping on it, pulling the cable, falling from pretty high, even went underwater once (not voluntarily I must admit) and they still work like new. Only thing I had to change was the cable.
The HD25SP's don't use the same drivers though. They don't sound the same as regular 25's (a little more muffled), the cable wires differently (in the regular 25, one side gets stuffed in the headband) and you don't get the split headband. But they are cheaper, and still pretty solid.
Be aware there are several 25 models. If you want to dj/produce with them, it's better to take the HD25-1. It's impedance is 70 Ohm, and is more suited for this use. The cable is 1.5m long, and it features a standard minijack, with a 1/4" adaptor included. You can find HD25-13's also, which are 600 Ohm. Generally more suited for hifi, and recording monitoring functions, where several phones are used together, 600 Ohm will provide more margin for excessive impedance drop. The cable here is 3m, and it features a standard 1/4" jack. Although I must warn you that in some countries I've seen they switched the cables between the versions.
If you are from the UK, beware for the so called British Airways batch. Some malintentioned people sold HD-25 headbands, with lower spec'd SP drivers, for the price of the HD-25.
Oh and finally, besided they being rock solid, if you ever break something, everything is replaceable. You can even get velvet earpads if you wanna pimp it 
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