Can anyone offer some insights on transitioning from NGUI's input handling to uGUI's

Now that uGUI is out, the last thing we're using NGUI for is input handling (OnClick, OnPress, OnDrag, etc.), so we're looking into transitioning away from it so that we can remove NGUI entirely. We leaned on NGUI rather hard, so this is a very extensive change, and before we begin the process, I was hoping some of you smart people could offer some advice and insights on how best to make the transition and any pitfalls to avoid.

We're especially concerned with any behavioral differences (particularly subtle ones), but any advice anyone has to offer at all would be helpful.

Thank you.