Blackbird is amazing and SOOOOOOO much better than Gianna's, which used to occupy the space, copied Vegan Treats desserts, and sold "vegan" pizza that actually wasn't vegan. Blackbird's pizza is not only super cheap, but it's also super delicious. A slice (1/4 pizza!) is only $3 for plain Daiya cheese, and the specialty pieces are about $4 each.
I disagree with conde.kedar that Blackbird introduced the concept of pizza slices to-go, as many other cities have done this for years (NYC is likely the most famous and most vegan slice-friendly, but Milwaukee also has spots), and Gianna's (Blackbird's predecessor) also sold vegetarian/vegan/supposedly-vegan pizza by the slice. That said, Blackbird took the quality up a notch and I am very happy they did.
I went with the nacho pizza, which had caramelized onions, avocado, jalapenos, and olives. I could have done without the avocado, which had sort of a crispy tomato texture after it was baked, but otherwise, the pizza was outstanding. The caramelized onions were key and I'm going to order extra next time. I also had a slice of the veggie, which had artichokes, green bell pepper, olives, and mushrooms (which I picked off). I preferred this slice and thought it was much better than many soy meat slices I've had elsewhere.
The service was very fast, considering how busy the dining room was and how many people were calling in for delivery ('twas a Friday night). Most of the people dining were young, alternativey folks that are probably vegetarian, but there was also an elderly couple enjoying some pizza. I got the impression they just stumbled in, not knowing it's vegan. Awesome. Thank you, Blackbird.