The Headphone Gods have smiled on me this day! The M1570C that I ordered the morning of 3/14 has
finally arrived. More impressions to come, but they sound really good for a closed back planar. I had pretty low expectations, though, given the stock closed tuning shortfalls of the M1060C.
Sound aside, there are some iffy things. My headband wasn't symmetrical (one cup sat lower than another when at the same extension), one cup doesn't have nearly as much resistance while being rotated, and the cable is pretty unwieldy with a 1/4 in plug (they did send an adaptor, but I much prefer taking a 3.5mm to 1/4 inch than the other way around). I was able to bend the headband a bit more even after some hand tweaking but it's still not perfect. For the price I paid, I don't mind these faults, but I would be pretty ticked at full MSRP. Probably mildly annoyed if I paid something like $400.
Up next, more listening, measurements, pad rolling, and maybe some light (reversible) modding.