my buddy has an f2, great entry level bike, you can basically do nething on it. It comes with everything you would need to do any style of riding depending on what you like, things can be removed and what not, i really like it. He does street and dirt and some park. We have done a few things to it, chopped the bars and the seatpost, lost 2 pegs, lost the front brake and got a new front wheel with a sealed hub. The cranks are the next thing to be upgraded because the one pieces dont last and they are becoming pretty bent. a good wheel set is also a good upgrade as those bikes don't come with a very good set, but overall great bike.
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