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I purchased MicroLab for travel. I own a KeyStep and an M-Audio Keystation Mini 32.
The MicroLab is twice as thick as the M-Audio 32, the key action isn't any better, it's heavier, it only has 25 keys versus 32 and it costs ~$10 more. The MicroLab does have Pitch/Category and Mod/Preset touchpads. I worry that the slender USB cord on the MicroLab will break relatively quickly.
I recommend the M-Audio Keystation Mini 32 over the MicroLab.