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diablo and the xcal2 are the ones to get. 430-450 is the usual. custom tuning available from reps, if not that you can tune to what you have, the diablo has a real time data, the only con i can think of is if your to cheap to get 91+ gas
they can change shift points if you have an auto, recalibrate for your gears if you get those, adjust the timing on your car for more power (all 4HP of it).
so are they worth buying, will i notice a difference\?
You won't notice the difference but it will help you more and more as you go down the modding road.
Yeah, they make a bigger difference the more mods you have. Plus if you ever get way deep into modding and need a dyno-tune the handheld can be used in place of getting a chip.