OK... stepping on the soap box...
Not really relevant in North America IMO. You get caught doing even close to 150mph and you are in jail in many places. At those speeds, if ANYTHING goes wrong (tire or other mechanical failure, animal, road debris, another vehicle doing something unexpected) and it is catastrophic. No place for that on public roads IMO. So, unless someone is a track junky (and there aren't many tracks you can approach that speed anyway), seems irrelevant to worry about speed limiters that are 150+ mph.
Yeah, I know everyone in this discussion has amazing skill and experience to do this safely
but for 99% of the driving population it's not realistic. My hundreds of track hours have only served to convince me that I would be an idiot to do this myself... now if you are in Germany and it's legal on certain roads, yeah, fine.
Now stepping off the soap box...