I've been wearing mine unmodded (gauze rolls under the pads) for a few weeks now, and I can say for certain that pierced cartilidge is very uncomfortable. I have soft jewelry for it too, and it still causes discomfort after an hour or so. My other ear, which has a 0g wooden spacer is fine, though. Still, after more than a few hours, both ears get irritated and red.
Thing is, its not a deal breaker. I'm not running around looking for the perfect holy trifecta of a headphone (sound quality, style, and comfort). Why? Few reasons. The sound and style are right there for me, and the XL pads should rectify the comfort.
Still a great headphone, and the comfort issue is being addressed so I'm not ready to give up on them, and I still recommend them to everybody who's looking for that trifecta, and be patient for the xl pads, or put some paper towel, or gauze rolls under the pads until then.