If a person was teleported, is that person the same person, or a clone?

By standard concepts of teleportation, a person is dissassembled molecule by molecule, recorded, and the data transferred to a new station to be reassembled. Now, is this peron the same person, or just a clone?

If he's a clone, does that mean in Star Trek Kirk died like 300 times?

And if the person is a clone, realistically, would this still be considered as a "reasonable" method of travel? Would science willingly allow the mass suicides of thousands of people for means of "convienant" transportation?