I am actually quite amazed at how good it is at detecting my finger tip taps. Of course, there are some times when it detects the wrong letter but with the text prediction in WM, it does help. And it's interesting that the letters pop up very much like it does in the iPhone virtual keyboard.

It does take a bit of getting used to, especially with the iSkin layout that I can only have 2 lines of text viewable. But quite nice. Being a Treo 750 user that already has a keyboard, I'm not sure how useful it can be, but it can help when I just want to tap without pressing the keys.