Repro carts are pretty reliable for the most part; another thing you could do is with the retron 5, you can get the famicom/super famicom/gba original fire emblem games and load the english patches onto the retron 5 so that you can play through the game in English along with the original cart. You'll also save some money for each game over time, since repro carts usually are $40-45+ per game, in comparision to $10-20 copies for Japanese carts.