Is updating to ICS even necessary? Can you get ICS features on marketplace?

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http://androidforums.com – Hey everyone, I will be getting a LG Optimus 3D soon and it will have Gingerbread 2.3.5. They announced ICS for the O3D Q3. I remember when I had an iPhone that their update was kind of useless as you could get those functions from apps if jailbroken. Now, can you do the same with ICS update? I looked at the new features of ICS and I don't really see any difference between that and Gingerbread. Now, i've never owned a droid phone before, which is why i'm asking. And if you can get the newer features, which apps are those? Thanks. (General)