It likely speaks to my ignorance, but my gut reaction to using electronic voting machines has always been that they are inherently insecure and can't/shouldn't be trusted to provide an accurate tally. There is so much money (available) and motive to cheat an election count that I have a hard time believing large and significant races haven't already been victims of tampering in the US (even if we haven't seen hard evidence of such).
Is this cynicism misplaced?