Well, I got a pair after reading good and bad reviews and looking at frequency response graphs of disappearing bass to see what all the fuss was about. While these are not the coveted Austrian-made 600ohm model they are good, make no mistake. At first listen I was disappointed, and many hasty reviews on here will echo my initial sentiment.I wanted to return them. But I at least owed them their break-in period to change my mind. So I left them playing nights and weekends at my office. They must have played over 80hours before I really listened.While they were breaking in I would occasionally have a listen, switching from my Senn HD559 & ATH M50x. And I still didn't like them. I though the bass was lacking but I was only focusing on the bass because that's what every other headphone I own or have heard emphasizes, and that's what the global consumer audio trend is - bass. I was listening to them with a flawed preconception of what I thought good sound is and what I wanted to hear.I forced myself to listen to them while at work to really figure this headphone out, and I kept switching back to my trusty Senn's occasionally to compare. Over the course of a few days I realized that all my other headphones are tuned for bass - fat, lazy, bloated, crappy bass overdose. I grew to appreciate the K240's for their neutral approach and revealing imaging and spacious. spacious sound stage. I am very happy with their sound and my patience has paid off. This is my personal experience with my ears and perception - your experience may vary.With a little EQ +4db low shelf fade from 0 to 80Hz I got the bass impact back that I was missing (withdraw symptom I guess). I eventually set this to +3db as the headphones opened up more with time.They are now broken in and have become my daily driver. I have put the others away and cleaned my desk. All I need, and want to hear, are these K240's. I'm done listening to inaccurate headphones.A buying tip - the Studio ones (gold) come with the pleather pads and the MKii (blue & silver) come with an additional set of felt pads - that's the only difference between the two. Save some money and the get the gold (Studio) ones because the pleather pads are the ones you want to use. They have a larger inner aperture, more space for your ear and have a positive effect on bass weight. The felt pads are too hard, their inner aperture is smaller and they actually negatively affect bass and impact.Mod tip - naturally the included cables are only good to hang yourself with. There are good quality replacements available on Amazon, just search. I also got some felt sheets, 2mm and 1mm thick. I cut them to the size of the round foam inlay (pops out when you remove the earpad) and I found the 1mm felt sheet delivers sharper transients and more slam.I power mine via a Fosi Audio K3 dac and a battery powered Douk Audio U3 headphone amp to great effect.