Had read about this place on HappyCow a while back and have walked by it a couple times while going to eat at Sage Vegan Cafe just a few doors down. Finally had a chance to try the pizza on 2 occasions. Was just here in February 2013. Here's my Masa of Echo Park review.
It's a casual, family friendly atmosphere restaurant, not fancy or anything. While not purely veg, it does offer vegan cheese and vegan chicken as pizza toppings. The regular menu does not point out the vegan specific items, so ASK for the vegan menu (that's also published on its website).
I knew I wanted to try the vegan Teese Cheese (made by Chicago Soy Company). Twice I got a bistro style pizza rather than a deep dish (maybe next time I will though) with added cherry tomatoes. A good size pizza for 2 adults to share. Price is now around $16-17.
Both times the vegan cheese pizza was delicious. I really liked the Teese cheese on my thin-crust pizza. It has a soft texture and is not greasy (like Daiya cheese gets).
I will return for the deep dish next time.
PS. Masa also offers a soy cheese that contains casein (dairy derivative).