I have never seen a laptop with such a powerful microphone like the JZ. I couldn't believe when my friends heard me whispering from the other room. The down side of using it is the fact that they will hear all your buttons and mouse clicks, which is probably annoying.
EDIT : One thing you should know: I own the razer kraken pro headset and when I installed the latest ( and older for testing ) drivers, the microphone stops working, but my older headset works fine. Without the drivers both work. The only logical explanation is that while both microphone jacks are the standard 3.5mm, the old ones have 1 ring or whatever you call the thing on the jack, while the kraken mic has 2 rings.
Just keep that in mind if you own some sort of expensive headset and want to use it.