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If a device like this goes asynch, that's usually a sign it's overloaded (it is being asked to do too much in too short an interval).
Sounds like a symptom of underdesign -- the cheap one sounds more peppy, which makes sense from an IRQ perspective (it just reads the button, which is probably done through i2c).
The KKSO3G is definitely a lot less asynch than DXG is; DXG routinely buffers keystrokes, whereas KKSO3G seems to have plenty of spare overhead to appear to be instantly responsive (and better debouncing so it doesn't grab extra strokes).
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