i own both, the first one is great, but a step different than the sequel... It's all in a black and white color (no colors whatsoever, i think it's to capture the feel of spectating the whole thing from a security camera, although the angles and stuff obviously breaks that whole theory, i like the style though)
It's pretty much just one whole day, of conflicts, things that get worse, and worse, and trivial matters that get in between it... It's great fun, and you'll love the Star Wars discussion
Make sure to watch the short movie "the Flying Car" too, it should be together with the first films DVD
After seeing Dogma, i have to say that i like the subtle approach of Jay and Silent Bob more too... They were acting the same and all in Dogma, but it just fits them better when you aren't "following" them...