Yesterday my Vox arrived from MobilePlanet. Here it is along side my SP3i, MTeoR, and my Dash (my SP5 isn't in the picture because I lost it and my Treo 770w now belongs to my wife :)

Here is how they stack up together:
And a comparison of the keyboards on the Dash and the Vox:
So far I really like the Vox. The keypad is very nice and the buttons have very good feedback. The slider is easy to use and the keyboard buttons are raised which makes it easy to type. The buttons are also larger than the ones on my Dash which are almost too small for my fingers. Almost.
For a full unboxing video of the Vox click here.
I agree with Greg, I want this application for PDC 07. :)