Peter,
It has been fantastic this past week or so with the comet chasing in dark skies (
here,
here,
here, and
here).
My EQ6 is obviously a far more capable beast, easier to adjust (polar alignment, changing directions, etc) because of its size, and much cheaper, but for portability and wide fields the Astrotrac is brilliant. I really hate packing up the EQ6 at dawn (heavy lifting + sleepy = unhappy me) but the AT is light and easy. Worst case scenario, I can just lift up the whole thing and throw it into the back of my van.
I have the whole kit (mount, polar scope, wedge, pier, head) - I'm unconvinced by the polar scope and head at this stage, but the rest is great.