Excite Truck sucked, im trying to sell mine. Its great for the first few hours, but after you beat Excite Mode (which was fun, dont get me wrong) the only thing left is to do it all over again on Super Excite Mode. There are about 20 courses which are repeats with slight modification and the trucks all pretty much seem the same. I would suggest renting it first.
It looks like quite a fun and crazy game to be honest. I won't pay full price for it, but it is definitely a game I'm interested in. I'll probably wait until it comes down in price, or get it second hand.