I haven't bought one, and I probably never will...
To me, achievements are a really big thing. They're why I play games that I might not like after 5 minutes, why I replay a lot of games, and why I get games I would've never played otherwise.
It's foreign to me why they
wouldn't include an achievement system...
The launch lineup is a little weak, and the battery life is pretty bad, but I could've overlooked those flaws if they had added some sort of achievement system...
No launch games really interest me other than BOTW, but I'm not going to buy a system for 1 game that I probably wouldn't even end up finishing...
I'm sure I'll get to play the Switch at a friend's place, so there's no reason for me to get one.
That being said though, it's a neat concept for sure, and BOTW looks great, so I'm sure the device will sell well!