Well I've had the Maltzilla for about 8 months now. Got the version with all metal rollers. I think there is or was a version with plastic rollers covered with diamond grit.
I haven't owned a mill before this and my only experience was with shop milled grain which I found quite variable.
I ordered the 24V power supply with it, this promptly blew up on first turning the maltzilla on. Luckily it came with some crocodile clips and an andersen plug connector. So I just used it by clipping it to an 18v battery which is fine ( see below ) .
I got a refund on the psu so no worries there.
So to usage, I do precondition the grain, just put the grain in a 30 litre storage bin and then spray and mix 2.5% by weight of water. I leave this for about an hour with the bin lid on and have left it longer then mill it.
The hopper is from a 12 litre water bottle and works well, its good that it is easily removed after use and so makes it compact to tidy away.
I cut a hole in a wooden board to mount the maltzilla. The board is bigger than another 30 litre rectangular storage bin so it rests on top of it. I have it so the motor is on the top of the board it can be mounted the other way up if you want. I would need a deeper bin to do that, it would be a bit quieter inside the box, but overall it is much quieter than drill powered mill or the brewshops SS brewtech mill.
The good thing about the board and mill on box is that it's sealed with the grain falling into the box so no dust, so I use it indoors without worry.
When finished I just flip the mill over and it is inside the box and the "hopper" fits next to it all safe on the shelf.
So does it work, yes, I don't think that the adjustment of the gap doesn't correlate that well with the markings. I'm using it set to 0.75mm which the gap measured appears to be 0.9mm . This is giving a good crush, the grains are really flattened and not chopped up at all. The grain contents are really powdered up but contained, I get a bit of flour but not much.
When you adjust the gap you adjust it on both sides of the wheel to ensure the gap is uniform across the rollers, I understand this has been an issue with other mills showing a different gap across the rollers which can't be adjusted.
The mill seems to only adjust in 0.25mm increments the way it's intended to be used and is a feature of the adjusters notching and locking with nuts. You can adjust it without taking it apart or using any tools though so you can tune as you go. To get inbetween gaps requires you to use the locking screws on top of the adjuster nurls which is a bit more fiddly, I haven't had to do this though. I'm getting a good extraction and flow on the mash 76 percent brewhouse efficiency and will try a finer gap to see how this affects things.
Occasionally I did get the situation where the non powered roller got stuck due to grain/flour on the roller preventing it turning. I just reversed the polarity of the power which made the roller reverse and this allowed it to clear. Then back to normal. It was more of a problem when I was using a NiCd 18v battery that was very end of life and lacked grunt and I had the gap a bit too wide.
If I was going to improve it I would supply some instructions, fit a small brush on the underside of the roller ( non powered one ) to knock off any accumulations and have a gate on the hopper so that it could be removed or inserted with grain in.
But I'm happy with it, it's quiet works well, is solid and does the job at a good price unattended so no drill holding etc.
Portly gentleman has a review on his youtube of the Maltzilla .
He also has a video of making a 24v power supply for the Cannular which is much cheaper than the kegland option.
He just uses the battery method as he likes to mill outside ( cordless ) . I certainly don't need the grain to mill any quicker than it does at the moment with the 18 v battery though I believe it would work quicker.
Think it's cheaper than some of the other mills supplied with a motor. Coincidentally as I'm typing this Genus brewing have a review of the Blichmann pro mill ( not sure if they bought it so could have bias).
Portly gentleman reviewed the SS brewtech mill and panned it and then returned it.
https://www.youtube.com/watch?v=ua8OUQESAgE