Having received both my dock and bumper today I can confirm that you can *not* dock the phone with the bumper case applied.
I can also say the the bumper is a particularly crappy product as it is not tight fitting, has play on the sides, bows in and out depending on how you hold it, and like I mentioned, does not work with the dock...
So yeah, I'm returning this thing, it's not very good product imho..