I'm on the fence on these...I grew up in the 80's and the NES was my first console so I want them for that reason alone. But I really don't enjoy retro gaming as much as some of my fellow Gen X gamers. I keep thinking I should just put this $30 towards a pair of real joycons (since I need a second pair right now).
Honestly, I didn't even get them for the retro games so much as for the D-Pad.
I never realized how much I would miss having one until I tried playing games with the Joy-Con and it's four distinct direction buttons. I have one of the Hori d-pads (thanks, Target Clearance), but that only works in handheld mode, and I play almost exclusively in docked mode. I do have a pro controller, too, but I like having the options.
Plus, I mean, yeah... retro games. This way when I visit my stepson he and I can play Mario 3 with the NES controllers instead of the joycons.