No, I used to use the Superfeet insoles, but I no longer think they're a good idea. I won't bore you with my whole plantar fasciitis story (it's probably in the archives), but I've come to the conclusion that unnecessary arch support weakens your feet, assuming your feet are OK to begin with.

The insoles I've been using are made by Spenco, and are perfectly flat, about 5/32" (4mm)thick, and are black foam with green fabric on top.