Here's what I wanted in a mill:
1. The ability to grind very fine flour.
2. A mill that could be cleaned well enough to grind gluten-free flours after grinding wheat.
3. A hand-powered mill to have on hand for emergency preparedness.
Since I couldn't afford 3 separate mills, I settled on the Wonder Junior Deluxe.
Here's how it met my requirements:
1. This mill can grind a very fine flour, but only if you grind it coarsly, then again on a finer setting. The problem with this is the second grind takes a VERY long time. Doing a single grind, I was able to grind 4 cups of hard red winter wheat into bread flour in 20 minutes. I was grinding like I was trying to set a world record though, just to see how fast I could physically grind wheat. I do not grind this fast on a regular basis. For comparison, I'm a relatively small female, and not in the greatest shape, but even my husband had trouble keeping up that pace. My four-year old can't even turn the handle. We thought the single-grind flour made gritty, heavy, bread, so I've been double grinding. It takes me about an hour and a half to grind the same 4 cups of wheat berries into fine flour, putting it through the mill twice. I do the first grind as coarse as possible, but still cracking the grain, hoping that the larger particles will feed through faster.
2. This mill can be cleaned well, but I had to use a Waterpik to get all of the wheat out of the auger. At least this mill can be washed - some can't. It is not very easy to wash, and I have to let it dry overnight before using it again. However, if you're not worried about gluten contamination, you don't need to do much more than just brush it off between uses.
3. I suppose this mill meets my "emergency preparedness" requirements. If I couldn't afford flour and had to grind my own, this would do the job, provided I had enough time. If I didn't have electricity, it would still work.
After getting frustrated by the amount of effort and time this mill took, I decided to try to hook it up to a foot pedal. I took apart some old exercise equipment for a pedal and sprocket, bought a bike sprocket and chain, and made a contraption. It works, but it's still really slow to grind flour this way. I found pedaling lying on the floor took way less effort than sitting. At one point, I gave up on this mill, and bought the Kitchenaid grain mill attachment for my mixer. After a couple of months, this attachment broke my mixer, so now I'm back to grinding flour by hand (and now kneading dough by hand too!).
Some other thoughts:
The mill seems to be built well. I've been using it regularly, and nothing looks like it will break any time soon.
It is capable of grinding rice flour almost as fine as store bought flour (again, double grinding).
It does not make consistently sized coarse meal. You get a mix of sizes, from fine flour to large pieces.
I haven't found much use for the steel burrs. Using them on grain, it is difficult to turn the handle, and it jerks as grain gets caught in it. I tried making peanut butter with the steel burrs. I had to use a knife to chop the peanuts into approximately quarter-peanut sized pieces to get them to feed through. It did make a nice creamy peanut butter. However, it took so long and made such a gooey mess, I don't think I'll be trying nut butters again.
It took grinding 15-20 pounds of grain to break in my stone burrs, not the "pound or so" that the manual says. I started throwing away the first couple of spoonfuls of flour, and I stop grinding when there was still grain visible in the auger. I don't know if that made the difference, or if the burrs just finally broke in. At least there are no more pieces of sand in the bread now.
So from what I know and have read, here are my recommendations: If you can afford the Country Living mill, buy it, not this mill. If you want to grind a lot of flour (and have electricity), get an electric mill (but not the Kitchenaid mill attachment!). If you need a hand-powered mill to grind fine flour, and this mill is all you can afford, it does work; it's just really slow and requires a lot of effort. If you are preparing for a complete disaster, consider whether or not you are really going to need to grind fine flour in that situation. For much less than the price of this mill, the Back to Basics mill will make coarse flour perfect for making hot cereal (or even slightly gritty pancakes or flatbread).
I'm on a tight budget right now, and justified the price of this mill with the money I could save on bread, so that's why I've been crazy enough to keep using it. What I really need now is two electric mills - one for wheat, and one for gluten-free grains.
**UPDATE**
I bought and installed the re-designed (new in 2011) auger. It works very well on things like corn and beans. However, now I can no longer grind wheat into fine flour, even when I double grind, and the handle is harder to turn. I have to add half white flour to bread to keep it from coming out a brick.
My original auger got rusty from washing the mill (so be really careful if you wash it - or better yet, don't get it wet). I am so unhappy with the new auger that I'm going to clean the rust off my old one and re-install it. Unfortunately, this is not an easy process, so I can't switch back and forth between the augers depending on what I'm milling.