A really quick glance at it in a VM, and overall liking the GUI. I would like recommend some splash tweaking though so make Vector that little bit better. I'm really excited about this release and the presumably upcoming SOHO version. Here's to tweaking VL to perfection!
XFCE Startup Splash Adjustment Recommendations: Before / After

- invert font colors to a white text on black background
- lower Sans Bold font size from 10 to 9
Login Screen GUI Adjustment Recommendations
Counter-Clockwise from top center:
1. Remove Logo. Redundant with the bottom right-hand corner logo.
2. Make Left Aligned
3. Remove underlining (despite any shortcut symbolism)
4. Lower password input box field to match the space between the text and input box for username
5. Adjust semi-transparent layer
- raised upwards a bit
- extended to the right to fill the area where the logo was
* the overall width may need to be shrunk
6. Adjust spacing and alignment of System, Session, and Enter buttons