Pizza Pi is owned by the same couple that owns Wayward Cafe, another Seattle vegan joint.
Pizza Pi lacks ambience, but the food here is very good. I had an "ex-meat lovers" 9-inch pizza with home-made cashew ricotta ($10) which was savory and had an excellent crust and sauce. I'd also never had vegan Canadian bacon before, which was a treat.
My friend's olive-lovers pizza was pretty good, though a bit too salty for me.
I especially like that Pizza Pi lets you choose between Teese, Vegan Rella or their home-made cashew cheese, as many people I know don't like soy/rice cheeses.
In terms of overall taste, I'm not sure I'd put Pizza Pi in the same quality category as Pizza Luce or Galactic Pizza (both in Minneapolis), but Pizza Pi is wholly vegan, whereas the others are not.
Next time I'm around I'll try a calzone and their garlic bread!