That non glass tank is weird, how can you tell how much juice is in there? Nice part it won't break but I have some short glass tank parts that came with it, so you can see thru it? I have not messed with mine yet.
I took it to mean that the tank is plastic rather than glass.
While it is true that you can get completely steel tanks, the standard tank has a clear plastic window.
Some people (myself included) prefer glass to plastic, because plastic can crack or become cloudy with certain liquids.
Having said that, for my preparations, I have standardized on the Kayfun Lite.
The plastic tank is a drawback, but the benefits outweigh that drawback for my purposes.
While it is less desirable in my opinion, plastic does have the advantage of being much harder to break than glass, which is good if you're buying gear that may need to last a long time with no spare parts availability.
There's always the stainless tank for tank-cracking liquids, and I guess the lack of visibility can be worked around to an extent.