I saw Grindhouse. Loved it. This is a typical Tarantino movie--vulgar, sharp dialog, well crafted. I think they just have used the m-----f---er about 1000 times. The fake movie trailers shown before each half are hilarious.
Tarantino's half of the double feature is "Death Proof", a car chase/revenge story about some stunt-girls who duel it out with a stunt man who gets his kicks stalking pretty girls in his big black muscle car. There is a lot of talking, which you don't mind much because there are four pretty girls doing the talking (interesting somewhat right-wing tangent on gun rights in one scene), followed by a pretty spectacular car chase. The car chase, supposedly was done with "real" cars, no CGI.
If you don't mind sitting through a (pretty funny) disgusting zombie movie to get to the car chase, and don't mind the word "m-----f---er", and understand Tarantino's idea of humor, then definitely go see it, you won't be disappointed.