once you buy the DLC you'll have to do a few quests before you get the jetpack, but its definately worth getting.
personally havent tried the other 2 DLC's but i've heard good things.
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Mech is ok, but imho vehicle drops slow down the pace too much to bother. The force powers they have is lit though The boats one is afflicted with being boats, but they injected a fair amount of overpowered gratuitousness into it so it's pretty fun. The gun you get at the end is also pretty good