The Pogo Sketch has a thick tip, kinda like a another finger.. The Dagi has a dot in the middle which hits correct around 80% of the times. Not perfect but if needed better than fingers!
I will definitively use the dagi when doing remote desktop work with the HD2. Until either the HTC stylus is released or Logmein/VNC apps change the way the cursor works. More like the iphone counterparts, move the desktop instead of the mouse etc. Seem more finger friendly.