"Still the defacto standard for tablets"5.0 starson by RGordon13
Pros: Fast (A6X) dual core processor (quad cord for graphics)
Dual channel Wi-Fi
Most intuitive OS anywhere
Lightning cable connects easier to iPad (less likely to damage the port)
Cons: Lacks expandable memory
Lightning connector requires adapter for most accessories and docks
Premium price point
No Flash support
Summary: I was pleasantly surprised with the improvement in response and browsing speeds between my new iPad 4 and my original iPad 2. Side by side in the store I didn't see much difference in the displays (non-retina vs retina), however, I've noticed it in use; especially videos and games. Comparing them in store using just the wallpaper didn't do the retina display justice.
I'll now be able to actually use the camera. The one in the iPad 2 was so low a resolution that I gave up using it. It's aggravating that the new lightning connector isn't compatible with my existing accessories, however, I absolutely prefer it when connecting my iPad to power. MUCH easier to connect it and I'm sure the same will be said for the new docks when they are finally available.
Worth the upgrade for iPad 2 users. iPad 3 users might not experience the same incremental experience though.