Downgrade or no?

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Forgive me, but I've been reading and haven't figured out whether or not downgrading from 1.5 to 1.4 is actually needed or what the benefits are. I'm new to the 3D, but not to android, flashing, or unlocking..I just can't seem to find (I'm sure the info is here somewhere) what the difference and advantages/disadvantages between the two. I'm perfectly comfortable downgrading, so I'm just looking for some input.

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