Weird list of brands instead of consoles.
My most memorable launch is PS2, I think. The selection of games was pretty lousy but it was one of the first console launches I was really excited about. Unfortunately, though, I had cold water thrown on it because despite having a PS2 reserved since like APril or May of that year, I didn't get "mine" until after Christmas from what I remember, I think January or February. But I was really excited for the PS2, obsessed with the games that were launching even though the list was really bad. I remember being really amped for The Bouncer too, what a disappointment.
The Dreamcast 9/9/99 launch was cool, but I didn't have a Dreamcast nd never owned one.
Realizing in this thread, I've never bought a console "At launch." I think the Xbox Series X will probably be the first new gen console I've ever purchased at launch. My family got an NES years after release, I got a Genesis a couple years after launch, got a PSX a couple years later (97 I think?), I pre-ordered the PS2 but mine wasn't available for months after launch. I didn't want an Xbox 360 or PS3 at launch, waited about 6months for both. I didn't want an Xbox One at launch, waited about 6months for that, got a PS4 with the Pro.