I swear I saw a thread with this title not to long ago but I couldn't find anything in the search bar...

Just got this for the DS; anyone here that's played it have anything to say about it? Would love some tips or advice if you have already played this through. All I'm reading from reviews so far is that for some battles it's important to switch classes and that there's a fair amount of lvl grinding.
Other than that I hear a lot of good things. =]