It's funny. The MD's have been at work for the past two months. At home I use the hd650 most of the time. Now that I have a second set of MD's for home, it's all the I reach for since I got them in.
It's the seductive ortho mids that draws me in. It use to be all about the bass for me. Then I still wanted bass but I began to appreciate the mids and a darker detailed treble. Now I have it all with the MD.
Why did you buy two sets? You like them even more than I thought you would!