This game was one of the reasons I got a Wii. For about half the price of a 360 Elite and 2/5 of the price of s PS3 Slim, I got a pre-owned Wii. There are more than enough games I can get right now, and more that are coming out in the future such as Tales of Graces, Dragon Quest X,
Tatsunoko vs Capcom, the next Zelda, the next 2D and 3D Mario games and Monster Hunter Tri, that really make it worth the £115 I paid for it. If you soft-mod the Wii, you can play all the games off an external HDD too.
As it says on Wiki (and in the first post) the storyline of Tales of Graces is meant to be one of the longest in any Tales game, potentially taking 70 hours (that's the main storyline, not including side quests, hidden bosses and unlocking everything in the game). Tales of Symphonia's main story was shorter than that IIRC but I still spent at least 250 hours on it, replaying it through with New Game+ in an attempt to unlock every last thing. That's the thing I like most about the Tales series; the ridiculous amount of things to unlock and level up. I prefer DQ for the exploration and usually prefer FF for the characters and storyline, but Tales games just have so much to do in them and so many cool things to unlock, like all the costumes and titles.