The killer app for me was Rogue Squadron 2. I got the Onyx GC at launch and later got the matching GB player. And Metroid Prime is most certainly a killer app as well.
It’s a shame that Wave Race wasn’t as good as the N64 version; they’d botched the craft physics. And I was hoping that I’d see the next addition to Pilot Wings.
I picked up a knock of Wave Bird controller from MicroCenter last year. It’s too bad that the WB didn’t have feedback.