401 is a good gyro, easy to setup and will get you well into 3d before needing replacing, piro rate is a little inconsistent tho.
I also have a csm 560v4 which is quite nice but is not forgiving to the model setup like the 401 (not that that's a bad thing really).
I'd place the 560 over the 401 if the machine is smooth, but i wouldn't buy a 401 unless it was cheap/2nd hand, better spend the extra £20/30 and get a 720.
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