Yeah, I had a lot of fun with it, and I was pleasantly surprised with how long it took. The game's well-written, too - the translators did a stellar job of making everything relevent and still keeping it genuinely funny. I really hope the other two GBA games somehow make it across to the US, too - I imagine they'd be just as much fun to play.
I must say, the game's actually got me craving some more murder investigation-type games. So much so that I'm actually thinking about buying Law and Order: Criminal Intent when it comes out, and I don't even like the show!