|Quoting comorin (Reply 9):|
I got mt fruitPad 2 four months ago but I shiver in fear as I read horror stories about upgrading from iOS4 to 5. I really need 5 because of some IOS5 only apps, and I am no Klaus when it comes to this stuff.
It's really not that big a deal.
I had both my iPhone 3GS and my iPad 1 upgraded to iOS 5 a while before I handed them to their new users, and they ran very well with it.
I see no cause for "horror stories" about it, just one issue to be aware of: The iPad 1 has just 256MB RAM, the iPad 2 has 512MB and the iPad 3 has 1024MB.
If you've got a big app which just barely fits into RAM with an older iOS version, it may not run any more with a newer iOS version which uses slightly more RAM for itself (if the app takes a long time to launch and if other apps need to start up fresh afterwards instead of just being there immediately, that may be an indication). This happened with a few apps on the iPad 1 in particular, but developers can still squeeze their apps back down to fit with the newer OS
version as well if they want.
If you've got such a critical app, you can also try to stop background activities such as mail push, skype standby and others to keep as much RAM available as possible, but for most apps that is not necessary either.
This is much less of an issue with the iPad 2 (or the iPhone 4/4S, which has the same amount of RAM) and of course even less so with the even larger iPad 3 (and the upcoming iPhone?).
The RAM size is the biggest difference between the devices, and if you don't insist on having every possible background task running all the time, you can use the older devices with the current iOS quite well.