Golden Grain Grinder -- aka Magic Mill?

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Has anyone ever used a Golden Grain Grinder Magic Mill? I found a used one for sale locally but I cannot decide if it is worth it. 

 

 It looks to be an older model and they want $350 for it which is why I haven't bought it yet. I'm also considering a much smaller rotsel hand mill which I may/maynot attach a motor to. Any advice?