Rack tent experience and suggestions?

[Tacomania]

Question of the hour for now: what tent do you run (if you do) and why do you like it?

Looking at the ARB simpson iii and kakadu. I found a pretty good deal for the simposn and annex combo for less than 1500.

I know there are a bunch of options out there, but your experience with each one is more important than specs on a website...