The Famicom 3D system works, and is actually pretty cool:
I got a good deal on this set (apparently unused? The plastic protective film is still on the glasses) along with a copy of Mega Man 2 (which I didn't already own). I plugged it in, and not only does it work with my wireless NES controller plug thing, it... works! In general! lol
I played a few minutes of Famicom Grand Prix II: 3D Hot Rally, and my Famicom actually looks like a 3D image. It's wild. I don't know how useful it'll be - I really suck at the game, so I barely saw any other cars, I'm not really sure why, but I only played for a few minutes. I'm definitely going to be messing around with it after work though.
Here's a quick review (almost first impressions in some cases) of the 7 Famicom 3D System games:
Attack Animal Gakuen - I absolutely suck at Space Harrier type games, so as cute as this is (you're a schoolgirl shooting down animals like kangaroos and flying alligators), I couldn't get very far in it. Seems cool, though.
Cosmic Epsilon - The MVP of the set, imo. It's a Space Harrier clone, too, but makes better use of 3D than Attack Animal Gakuen and isn't quite as hard, though it's still quite difficult. Easier to see enemy attacks/where you're aiming. Looks and sounds great, too.
Falsion - This game is a mess! I can't tell what is going on in 2D or 3D. I was hoping the 3D would make the game more palatable to me, but as is, it's far too difficult to figure out what the heck is going on, and the 3D isn't implemented well at all. Shame, because the music rules.
Famicom Grand Prix II: 3D Hot Rally - Pretty fun game, though man does it get difficult later in the races. 3D works pretty well, I'd say, though I get bored of the game before the races end, if I'm honest.
Highway Star - Never could get into Rad Racer, and 3D doesn't really help. Not a bad game, just less interesting to me than 3D Hot Rally.
JJ: Tobidase Daisakusen Part II - My other favorite game for the 3D system. Plays better than the first game, largely because there's only one speed, so you're much more in control and can concentrate more on the hazards than trying to basically guess how fast you have to be going to clear a huge pit, like in the first game. Fought a boss which was pretty cool, though I'm not sure when it's at the same depth as you - when it is, you can crash into it and die, which I did a few times. Playing it safe takes a bit, but I was able to beat it. I got killed in the next level by the stupid eyeballs that linger on the screen after you've already ran past them, which are annoying.
Fuuun Shourin Ken - Ankoku no Maou - No idea what's going on in this game. I mean it's a fighting game, but there's story and stuff and it sure ain't Street Fighter II, so I gave up pretty quickly on this one.
---
I think the Famicom 3D System is actually pretty neat, and wish a few more games were made for it. Funny story, I popped in my copy of the first Tobidase Daisakusen and was baffled why the 3D wouldn't activate when I pressed select - turns out that game is unsupported and had its own glasses that it came with, so I was wrong when I thought it had Famicom 3D System support too, heh. My eyes were getting tired though after nearly two hours of playing, which is likely because the system has a weird strobe effect as you play - sort of a flashing of the background that I think is a result of the way the system works, which means it's unavoidable (it's present in every game). I'll definitely play more Cosmic Epsilon, though, that game is cool as heck.