Only half the goodness.
While it is a very good product, I did not like the fact that it was only one sided. Furthermore, the mic is nearly useless when it comes to blowing, as the mic is not very well positioned. It is however, good for voice chat and it may very well be good when you have to shout at the mic.

A decent product all in all, though it lacks in some areas.

Good idea, bad execution.
Just got mine, and while the quality of the product itself is indeed very good, the fact its only one of two audio channels is not, hence practically destroying the entire . If nintendo had had two ear pieces, it would've been far better, as you'd get the full sound and have a decently placed mic to boot (for voice chat, for blowing up baloons in mario kart ds it's poorly placed I suppose).

One-sided earpiece
If it was 2 earpieces, it will be perfect. Mic seems to be working fine though.

Awesome!
It's cheap and nice.