I bought a Retron 5 last month and Im really enjoying playing my japanese games in english on a HDTV. Currently playing Fire Emblem Binding Blade and its so much easier when I fully understand the menu, and I can enjoy the story.
Before having my Retron 5 I bought a re-pro cart translated, worked fine, but was really expensive (45$) for a loose cart, while now I can buy the japanese original for 10$ and just and the translated patch.
Even if the Retron 5 seem expensive, I highly recommend it if you like JRPG on SNES and GBA, most of them are fully translated.