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are they coming out wit the boss in star plastic?
Different colors are made on different days. So, there if there is a change in ambient temperature, humidity, barometric pressure, etc you might see a difference in the disc. All of these (and more) affect the disc as it is being molded and then removed from the mold. Different colors flying differently is somewhat to be expected. You would like that difference to be minimal though.
If you can throw the boss successfully, then the Groove is not for you unless you are a plastic monger. If you can hyzer flip a boss, then you will likely turn and burn a Groove. Its not gimicky, its a company being smart and marketing to people with different abilities... I'm a plastic monger though, so i'll likely get one as well! lol