I have to admit, I never heard of a Mack Spinner before this discussion (I know, I'm a "newb"...), so I looked it up, and it looks like a fun ride to me. As I was looking it up, though, I saw a LOT of hate for it on Reddit, mostly from people who just sound way too self-important (when people write things like, "It would be an absolute DISGRACE if they replace Kingda Ka with this ATROCITY," I just can't take them seriously. Like, we're talking about roller coasters here, not human rights. Calm down.)
I do get the concerns about capacity, and having never ridden a Mack Spinner, I don't actually know if they're any good, but at least it's something that the park doesn't already have, so I'd be excited to try it, IF that's what they're building. Hopefully they can figure out a way to manage the capacity issue.