What is Reddit's opinion of CHARD GM-150 Grain Mill, Tin Coated Cast Iron?
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6 reviews of this product found across Reddit:

Cheap corona mill from amazon, I got it for $28. I replaced the handle with a regular bolt and drive it with a cordless drill. Other than that, no modifications necessary. It works great (80-85% efficiency), paid for itself super quickly, never jams/slips, and I can use it for other grains like whole corn pretty easily.

I used to own a ~~cereal killer~~ barley crusher (rollers rusted out in a basement flood). Only thing I liked better about it was the bigger hopper. Other than that the corona mill makes zero difference to my brew day / beer, and cost me less.

I've used this, https://www.amazon.com/CHARD-GM-150-Grain-Mill-Coated/dp/B00A2YG6C0/ref=zg_bs_3117957011_30?_encoding=UTF8&psc=1&refRID=4CGSJX200MXYX47DCY1Z

Its hand powered but its cheaper that 3 kg of PLA. You do need fresh pellets to mix in for decent filament to run. Theres some chemical that depleted in the printing process I believe, and PLA gets brittle the more times you recycle it.

Not really. A corona mill is $27. Add $6 for a bucket, some wood and some screws, and you have your milling station. That's 36% of the cost of a cerial killer...

CHARD GM-150 Grain Mill, Tin Coated Cast Iron https://www.amazon.com/dp/B00A2YG6C0/ref=cm_sw_r_cp_apa_T-lrBb28H62SR

This is the exact one I use, with no mods except that I removed the handle to drive it with a drill. To do this, just go to a hardware store and find a bolt or threaded rod that fits into the drive axle, then you can use a socket attachment to get your drill on there (or just chuck straight onto it, if you went with threaded rod).

I have a cheap hand grinder, and just eyeball it to make sure that all the grains are getting crushed ( http://www.amazon.com/GM-150-Grinding-Multigrain-Soybeans-Shelled/dp/B00A2YG6C0 ). You might be draining too fast at first if you are getting a stuck mash. You want the bed to condense a little, but not compact like that.

Get your uncrushed grain in 10lb bags from MoreBeer, shipped free, and buy yourself a cheapo Corona Mill similar to this https://www.amazon.com/GM-150-Grinding-Multigrain-Soybeans-Shelled/dp/B00A2YG6C0/ref=sr_1_7?s=kitchen&ie=UTF8&qid=1467673211&sr=1-7&keywords=grain+mill for about $20.00 and grind your own. They work well especially if you/re mashing in a bag. You'll pay for the investment in about a month or so depending on how much you drink and brew.