I've been obsessed with it since it came out about six or eight weeks ago. What a great game... it preserves a lot of the "old school" feel with a similar, basic gameplay while introducing some new elements (music, continuous play, stacked monster-eating scores). I love that the various modes are timed; the time limit makes you focus on efficiency and strategy rather than simply eating, though there's plenty of eating, too.
I just set my record two days ago, and my high score in 5 Minute Championship Mode is currently in the top ten in the world on the Xbox Live leaderboard All-Time list and #1 of all American players. The Japanese seem to have a tight grip on most of the top ten positions, but I'm trying very hard to break into the top 5.