A stylus responding device which otherwise would need 2 handed operation is fine but how do you use it on a mobile when your other hand is occupied, like carrying / holding something.? I also recollect that these stylus operated devices had pressure sensitive touch pads and as a general rule that got damaged / scratched too quickly. I believe Palm Pilot was an exception to the rule.
I am very happy with the capacitive touch pad (actually glass) on my Galaxy. mobile.for single handed operation.
What I would
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