In Samsung's defense, I don't think it's that easy to make a proper ICS update that works 100%. It's not like everything is great with the tabs that got updated to ICS. Like this Huawei tab, with ICS and after several betas, hdmi out is bugged, it crashes every now and then, 3g has connection problems, browser crashes, etc. The worse bit is the battery that feels like it's 50% of what it was in HC.
Yes it's smoother, but in the end it's not like everything is working.
I had a Transformer and ICS was pretty buggy on that too.
The only device i know that has ICS working really stable is my galaxy nexus.
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Galaxy Note 2
Galaxy Tab 2 10.1