The demo unit in the store I went to yesterday sometimes required multiple pushes to get it to work. It could be that it had been mishandled by all the customers, or it could have been the lag in the phone. The device was freezing up for a second or two, then resuming normal operation. I noticed this while typing a few messages as well. The letters I typed would seemingly not be recorded, and suddenly they'd all catch up in one big rush.
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