I am a JRPG fan, but not a dungeon crawler fan.
I was only a little curious about Etrian Odyssey IV, but once I started playing the demo I couldn't stop. This game totally sucked me in. I bought the full game and transferred my save file from the demo.
Don't worry about people complaining about a high difficulty. You can suspend save whenever, and warp out of a dungeon at any time (with an item) to make a permanent save.
I recommend this game to anyone who likes RGPs, from the casual fan to the hard core.