I finished off the Lost in Nightmares DLC for RE5.
A little not to any of you planning on playing it: you have to do it all in one sitting. There are no save points. The checkpoints are only there to restart if you die.
That said, it took me around an hour to beat it (with reading all the notes left behind). It's a lot more along the survival horror mood of the first couple games, than the more action oriented 4&5. Limited weapons, quiet environments where shit could pop out at any second, etc....
The ending's just one of the flashbacks from RE5, so it was a little anti-climactic, but fun either way.