She is a rather large amount of trouble to go through for, but I work the rest of my team so hard that the small amount of people I train, say Bartre, Raven, Dart, Hector, Lyn, possibly a Pegasus and/or a color knight, not counting any healers, are all reasonably close to topping out by game's end anyway, so I'm not really missing out on training when using her. Plus she's a good enough unit to end up able to righteously murder almost anything, and she can often mop the chandelier with any of my other magic units even if she hasn't been promoted and they have (on one occasion, level 15 Nino > level 28 Erk). Plus I like a unit with Rocky-style leveling curve, mostly because it seems like they really earned their right to party.