I made a jump from Sennheiser 660 to these and amazed once again what people can do with audio headphones. This is a significant overall increase in sound clarity, space, instrument separation and even just enough added oomph! with the bass that I felt my Sennheiser's were missing. I'm not in anyway a basshead, although I previously purchased a small Schiit EQ for more bass for the Sennheiser 660, but now feel that was money wasted. I don't feel these Hifiman need any adjustments at all and just sound perfect on their own. I listen to mostly rock music, but also like Enya, film scores, classical, electronic, metal and industrial...all of which sound wonderful.Currently on sale or clearance, maybe to make room for the new Organic Arya, I got for around $900 which I feel is a fair price for the upgrade from the Sennheiser's. Also make sure you get from the Hifiman store directly. Originally I was looking to purchase Sennheiser HD800s from Amazon, but they came from a 3rd party seller and looked suspiciously refurbished to me or at the very least a previous return. The Hifiman came very much sealed and untouched straight from the manufacturer.