TheEmrys wrote:I'd be hard pressed to say they are going to be significantly better than Beats by Dre Pro at $400 or the Sennheiser 595's at $200. There is going to be some seriously diminishing returns with audio. Personally, I'd lean to the older 595's but Beats definitely have a cool-factor to them. They are powered by battery, and when it goes down you are sound-less. The 595's run... shoot, $150 now?
The Beats Pro are a completely different kettle of fish as they are closed and the HD 650s are open. In my experience, all things considered, open headphones usually trump closed. The advantage of closed is that they don't disturb those around you (anywhere near as much anyway), they block out external noise - which might come in handy if listening in noisy environments and don't want to damage your ears - and are more conducive to noise cancellation (like the pro). Open headphones have and airier, somewhat more speaker-like sound (at least near field speaker listening) and your ears don't start to sweat if using them during an intense gaming session.
As for whether they are worth the cost.. I probably wouldn't spend more than $400 on them. It depends how much you treasure hi-fidelity, how much you like the HD-650 sound signature, and how good your other equipment is. If you have a nice balanced DAC, the HD-650s can be worth every penny. If you are using them with integrated audio on a PC then something sub $200 (and probably significantly less) like the Sennheiser HD 558 (if you like Senns) or Audio Technica A700, etc, would be about the best I'd recommend.