i’ve just updated my iphone(BL 3.9, first-gen 4G version) from firmware 1.1.4 to the new 2.0 by the newly released winpwn. Actually I pwned the phone twice, first with winpwn 2.0.2 and second with winpwn 2.0.3(download).
I am a little bit excited about some of the new features in 2.0, even if until now I only played with it for 2 days. Here’s why i’m saying that.
1.full system-level international support


For Chinese iphone owners like me, we can choose either of Simplified Chinese and Traditional Chinese. Accordingly we have the input method and region format.Yes, we’ve got hand-writing input method too, as picture shows above.
Besides, we can read gb2312-encoded Chinese email now.
2.App Store

This is the coolest part. Tons of apps in the store and you are just one-click away to them.You may also feel surprised when you are playing with those really creative apps, like WritingPad(reviewed by ipodtouchfans.com) and midomi(youtube video). I do. I really do.
However, in order to take full use of the App Store, you need an valid iTunes account. And generally you have to provide some payment details in the registration process, like an Visa credit card info. This may block some people. Hackint0sh has a post here where i found this solution. For the phone number and address, i filled with Apple’s own info
3.some new features, like Contact Search, WiFi-only mode, Exchange support etc.
Some of you may feel more excited on Exchange support or Contact Search. Sure they deserve. But for me,I think wifi-only does help. I do have that kinda moment when I wanna browse the web while keeping the phone off. Not possible in firmware 1.1.4 and below.
These are all the reasons that drive me to do the upgrade. But, nothing is perfect. iPhone 2.0 still needs improvement as well. As to my experience, 2.0 is a little bit slower, less stable than 1.1.4. Perhaps that’s why Apple is pushing the testing on 2.0.1 now. Guess they’ll relesae it soon.
Last but not least, currently there are very fewer native 3-rd party unofficial applications in 2.0 than in 1.1.4. To update or not, you decide.