It's not worth it. The N64 emulator is still worse than others available and you can play ony a small amount of titles instead of buying/playing the ones you like.
You lose almost all Animal Crossing and Mario Kart DLC content as soon as you quit the subscription.
The only reason I would pay more for the online service would be dedicated servers. Mario Kart and Splatoon just suck online with all the lag and P2P connection. On the other hand, Rocket League and Ninjala are fun to play online because of dedicated servers they use.