Okay, disclaimer: I'm from SoCal where pho is plentiful and dirt cheap so my five stars is for Phoenix locations.
We frequent Pho Saigon Pearl often because we love pho and it's close to our house. The staff is always very courteous, we never have to wait long for food even when it's busy, and the restaurant and bathrooms are always clean. They're not the cheapest (around $10/bowl) but portions are generous.
I appreciate them a lot because whenever we come with our kids they provide us with extra bowls, spoons, and scissors to cut food without us even asking. Being accommodating to families is a huge plus and it makes it a lot easier to go out without having to haul around extra stuff for the kids.
My only qualm is that the spicy noodle soup isn't very spicy at all, but that's just preference. Otherwise we enjoy our meals here. =)