Comfort is the
PlayGear Mod's biggest drawback. Even looking at it in the box, I could tell this would be an issue. The headset is a single-piece design and isn't adjustable. Unless you have a really big head, the headset should work fine, but since you can't adjust the band, the headset feels loose and uncomfortable. A set of rings are included to hold the ear pieces in place, though these only add to the discomfort since you basically just have two pieces of plastic gripping to your ears.
The single-pieced design also doesn't do much for the PlayGear Mod's portability. Since you can't roll or fold them up in anyway, it's really hard to stow the earphones in your PSP case and go. While on a car trip, this probably wouldn't be as much of an issue, but anywhere else, it just seems like a problem and one more thing to worry about.
Overall, the PlayGear Mod is a good set of headphones as far as construction and sound quality go, which makes them a good purchase if those are your main concerns. If comfort and portability are slightly more important to you, then you may want to look elsewhere.