Well, if the technology actually existed, it would solve that whole “soul” question.

We would know pretty quickly if we transported humans and they came out the other side as soulless aberrations because their original just got killed.

So yeah, I would 100% use it after it first proved once and for all that the sum of our consciousness really is all the synapses and signals and grey matter in our heads. Because if so then what does it matter if your original matter has been erased and then recreated. Your clone is just as much you as you are you at that point.

Absolutely this.

Someone else can be the guinea pig, but if it's been tested and everyone came out fine? Yeah. I'll absolutely take advantage.

Even if the clone is undistinguishable from your old self, that old self has died. “you” has died. You didn’t teleport to Mars, you died on Earth.

You're repeating what OP said.

Thing is, the idea that an "old you" has "died" is a modern soul conceit. If "me" is just the combination of meat, electricity, and memories - then for all intents and purposes I was simply taken apart in one place and reassembled in another. Continuity of all three is maintained when I am reassembled on Mars with my body and memories intact. There is no "old" and "new" me - because what you or OP think defines "me" isn't something that dies when the meat stops working briefly.

But we can "prove" that isn't true because what if you aren't disassembled on the first side? Just copied over. Either you have a sense and control of both bodies at once, or in a real teleport where you are disassembled, you're gone the moment you teleport and the "you" that remains is another different person with exactly your thoughts, feelings, motivations, memories, etc.