Quick first impressions:
Right out of the box, the bass was incredibly boomy, one could almost say, "skull rattling" and the treble sounded...off (probably rolled off). The midrange was present, not incredibly forward, but it was definitely getting covered by the quantity of bass. I will say I was coming from a pair of Donscorpio Dolphins that I really like, but don't fold up, so are not as portable.
Comfort wise, it wasn't horrible for my above average sized ears, but I had more problems with keeping it on my head (I have a rather large head), it kept slipping off, especially when I looked up. However, I could easily tell that I would get annoyed by the small amount of padding and clamp of the headphones if I kept using the original padding for a long period of time. So, with that in mind, I took off the original circular pads, and put on the dark red Brainwavz pleather memory foam pads that I also got with the headphones. And compared to the less than 5 minutes it took me to replace a pair of Monoprice 8323 pads with velour pads that I got for a friend, this was a bit tougher. It wasn't just the fact that it was trying to put an oval pad on a circular driver, but the opening was a smaller as well. Took me about 30-40 minutes of fiddling to get them on, but I didn't have to mod the Brainwavz pads at all.
Word of advice, don't worry about lining up the pad vertically at first (the pad doesn't stretch enough to match the drivers), first get the pads fully on the driver first with an approximate place within 45 degrees where you would wear the pad, then you can just rotate it slowly to the appropriate position that you would want.
After replacing the pads, completely different headphone. The almost-skull rattling bass that was covering up with the midrange that you could you feel was gone, replaced with a headphone that is still bassy, but in the fun kind of way. The midrange is still not prominent, but it's not being colored too much with the bass. Treble is still rolled off, but now it doesn't sound off, just not as prominent as my Dolphins. The comfort is increased 10x, and now doesn't slip off my head. The clamp force is now working for you by keeping the headphones on your head, and giving you a good seal, instead of pressing against your ears. I can see myself wearing this for hours and hours. Also, with the dark red earpads, the headphones look pretty snazzy.
That's all for the quick impressions, I'll post a comparison with my Donscorpio Dolphins and modded ATH-M50's with Beyer Velour Pads (I absolutely hated the original pleather ear pads, as they pressed against the bottom of my ears) at a later date, but so far, I'm really liking this 50 dollar investment. The impressions of the sound, of course, might change as I use the headphones more, and comparisons with my other headphones.
Edit: Now with photos! Pardon the variable colors, using my phone camera.
Comparing the thickness of the original ear pad to the Brainwavz Pads:
This pic probably has the most accurate colors of what the earpads look like.