wow, SC more technically advanced for once. We have digital voting machines - you enter your vote into the digital machine with no paper ballot. Staff at a desk record your name into the log book and give you a red tag. You wait at a short line for a voting machine to come available. Another polling place staffer walks you to that machine where he/she inserts a large red block/dongle to enable the machine for your vote. When done, you just leave and they remove the red dongle.

Now, drawbacks? I don't think you could technically do a recount other than compare the logbook to the number of votes the machines totaled. You would also need to go to some really great lengths to make sure that machine (and however it sends it's data) can't be tampered with.