I'm on NES. I started on SFC which looks like maybe the best version, but I felt pity for the NES completions thread and switched to NES. It seems like a pretty great version though, just the original with type-in stuff changed to menus.
And yeah, I'm having a lot of fun. Certainly a lot more fun that all the times I tried to play it as a stupid kid. I can't imagine walking into this game and it being your first dungeon crawler. But as an adult who understand the genre more and is willing to figure out confusing maps, I'm in. I've read bad things about unfair difficulty and instant kills later on so I'm hoping to persevere.