Is it worth upgrading?

If you are going to buy a new iPad then buy the iPad 3.

I concur with Kappy, if for no other reason that Siri, coming this fall in the just-announced iOS 6, will run only on the new iPad, not the iPad 2. There may be other feature that won't work, or won't work as well, on the older iPads.

http://www.apple.com/ios/ios6/

And given that iOS 6 won't support the first-generation iPad, it's reasonable to conclude that iOS 7, which if Apple's pattern continues will probably appear this time next year, won't support the iPad 2. So if you buy the new iPad now, you'll most likely get an additional year of iOS upgrades.

Regards.