I mean it seems about equally as invasive as an IUD. I bet people could get used to the concept.

Well, I've not had it since it isn't available yet.

But I get what you mean about the needles in the dong.

But most likely, the needle is through the side of the scrote, which might not be much better.

Probably best to just not watch.

It is less invasive than a vasectomy, since it's a needle and not a scalpel, but ofc it's not as simple as a pill

On the other hand, it's one-and-done and nevermore worried about unwanted paternity claims.

Not in your dong, the only thing in there is the urethra, and unless you never want to pee again you don't want to block that. The injection would probably be somwhere close to where you would cut the sperm duct in a vasectomy.