Friends don't let friends watch the extended version of this movie
Even Kevin Smith didn't approve, calling it the extended version because he considered the theatrical version the director's cut to begin with. The timing is completely off and really turns a great cult-classic into a mediocre mess.
If you're a huge fan of the movie then give the extended a try sure (be prepared to grimace), but definitely do not let anyone see the extended version first. The theatrical version is vastly superior in every way.