I agree with Gerrye. The majority of users reporting problems as a result of the upgrade are most likely because of inferior hardware components. Let's not forget these things are massed produce so there are going to be failures.
I personally own 2 PEs (my son has one) and an EE and all three are upgraded to Ermine. On the PE the upgrade is flawless. I have not had any major problems with the upgrade. I upgraded both PEs on day 1 which has been almost 6 months ago.
On my EE the only problem I have had is an occasional stock browser crash. I primarily use xScope anyway and it hasn't crashed on me once. I haven't experienced the hibernation lockup some other full-size eDGE owners have.
The advantages to upgrade in my opinion are a much nicer interface, improved speed and functionality of the device, the ability to put the eDGE into hibernate, better handwriting recognition, access to the Amazon App market, and the ability to run most Apps designed for Android 2.2 and above.
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