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I can't recommend this game enough. It is easily a Top 10 NES game like Mario 3 and Mega Man. I don't recommend things often, but I do implore everyone to check it out. The game is both a marvel on a technical and mechanical level for an 8-Bit game.
Since this is a Smash Bros site, it should also be mentioned that Sakurai himself praised the game and recommended it to GameCenter CX years back.
It's also worth noting that a loose Famicom copy goes for $600 on used market, while the PAL NES version goes for $900. This is the first time it's been released in the North America.