... This machine is not bad for RPN logic at this low price point, so I would like to award it 3.5 stars, if possible. I only use basic TVM calculations and arithmetic and percent functions.

Criticism: The rubber feet are strips that are convex, causing the device to rock on a flat surface when punching the unsupported outer keys. Now I have applied four self-adhering feet in the extreme corners to prevent this. I suppose the sharp edges make hand holding it more secure, and my finger stabbing the low-resistance keys is not tiring.

I miss the bold numbers with large comma separators of my antique vintage HP 15C scientific, which was expensive, and the battery life (24 years). That one is still running, though a black substance is oozing into the LCD panel and a segment has burned out at year 25. Like most cheap commodity items, I do not expect the 20b to last that long!





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