i just got a pair of EX51s (same as EX71, but without the extension) and my initial impression is that the midrange is flatter and the bass much heavier than my MD33s, as people have written. i haven't properly burned them in yet, so I'll make a fairer assessment later. I will add that while they seem to fit my ears better, they seem to offer slightly less noise reduction (but with less microphonics) and the same degree of isolation as the MD33s. the MD33s, with their crisper midrange and lighter bass, are enjoyable at a lower volume level; i've found myself cranking the EX51s a bit higher, searching for better clarity, which causes the sharp highs to lean toward headache-inducement. the biggest positive over the MD33s besides the fit is not having to use a 1m 4-pole -> 3-pole adapter. however, based on my experience so far, I certainly find myself preferring the MD33s. I'll allow the EX51s to burn in some, though, before i offer a conclusive opinion.