I say it is totally worth it. And there's nothing like playing games on the original hardware.
But to be honest, I pretty much gave up on Castlevania after playing Simon's Quest. I gave SOTN and Curse of Darkness a try but it just wasn't the same magic as the original NES title (a really hard one but gratifying when I finished it 20+ years ago). I wish I played this Chi no Rondo back in the day, but I was pretty busy playing Sonic, Shinobi, Streets of Rage, TMNT, etc on my Genesis.
I just pulled the trigger on this one instead of wasting my $ on say, Madden 13.