My only problem with the bowls was the cut-out. As mentioned, the outer folds of my ear pressed against the exposed plastic and got horribly uncomfortable (see: Painful) VERY quickly.
After going through the forums, however, I came across a simple mod where you just pop the bowls off, cover the driver enclosures with cheapie Panasonic earphone pads, and pop the bowls back on. The result is not unlike a bowl-flat, with the driver output completely covered by soft foam. An added bonus is that it brings out just slightly more bass at the expense of the highest treble while out and about, making it far better for portable use. Plus, I can wear them for hours and hours at a time now.
At home, of course, I take the extra foam out, but I use my K701s for most of my indoor listening anyway, so the little mod is all but a permanent fixture.