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No because 3.0 is buggy as hell.

And if you need to jailbreak/unlock it can easily be done with blackra1n on 3.1.2.
Can you tell me more about it? I have 3.0 now but not noticing so much bugs. Battery life is fine.

Is there a comparison between them?
 
I've had 3.0 JB since it came out on my 3g as well. I have no problems with it and I see no point in upgrading to 3.1.2. Everything works fine and dandy for me.
 
When I was on 3.0 I was experiencing a lot of App crashes. If you're not having those problems then sure you can stay on 3.0, but I don't see the point really.
 
I don't know bout you, but I can't seem to get new apps installed on my phone. I'm on 3.0 as well and I just bought GTA:Chinawars which does not support 3.0.
 
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