I got the ZM-MIC1 myself and I simply have it attached to my keyboard cord (or rather my mouse cord, that is connected to my keyboard). It does pick up the sound of the mechanical keys, but my friends assures me that it isn't an issue unless it gets hectic in games (like me playing Armadon in HoN...). I picked mine up for 45 SEK, and for that price it is absolutely amazing.
It's worse than my "studio" USB microphone (which is essentially a Logitech microphone in disguise), it's way worse than the microphone in my webcam (Creative Live! Socialize 1080p), and about on-par with the G330 headset microphone (this one is better due to it being located directly in front of your mouth, but the sound is at the same time worse).