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Don't care about the money. It's the convenience, particularly while on a plane, in an airport, or meeting rooms. It's just one small piece of equipment (no wires), and I can simply snap it in place and still have one unit.
While the external keyboard may be faster, as you note the key factor is intended use. For me, it may include moderate data entry while traveling, but not so much that I want to carry around a foldable keyboard and connector. I hate carrying around a tangle of wires and additional equipment. Hence, if the Dell snap on keyboard, or another manufacturer's thumb board, provides good performance, I think it's the ideal solution for middle of the road usage.
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