To me, at least prototype model up here, are definitely not bad at all and hold their own. I had them for pretty short time and couldn't do any direct comparison with models you mention, but I do believe they could easier take vs. big boys, however... Most of my concern goes to their industrial look, while they are pretty light and comfy, even liked them better than HD650 or K701, but they don't have the "fancy" look, which for lots of folks still a must, however you pay EUR 199 for new instead of EUR 300+ for K701 or HD650. Also found them, based on my system at the time, more flat/neutral responding than K701 or HD650 for sure, so, like any other brand, they have had a very good potential to shine in the matched system. Later, I got the chance to hear the original released model and they were not the same sounding as prototype. They had more artificial kind of sig, but also less flat/neutral, which was a bit disappointment, to tell you the true. But even then, because they weren't burned fully and didn't had an after market cable installed, its pretty difficult to say the last about them.