Sounds like it fixes some of the first DS FE's problems, anyway... it doesn't fix the bad graphics, though. And what about the story? Sure, having support conversations back is great, but is the main plot any better than the simplistic and bland one in Shadow Dragon?
As for difficulty, I managed to beat US FE: PoR on Hard, and FE (GBA) on Hector's Normal, but stuff like Lunatic, I don't know... PoR Hard was pretty hard and took me quite a while to get through, something like Lunatic Reverse sounds just sadistically unfair. On the other hand, Casual Mode, sort of like the in-mission saves in Shadow Dragon, is something that reduces the difficulty of the games in ways that go against the traditions of the series... in-misison hard saves? Really?
On that note, another thing I disliked were there parts where it forced you to sacrifice a unit. I try to keep all of the players alive, forcing me to kill a character off in order to progress in a FE game is just wrong and should never appear again... not sure if it's in the other DS game too.