I wrote a faux review for a college class on this place. I can't recommend it enough. They make some really fantastic looking cakes but I can't say I've ever had the occasion to pick one up.
What I have had, however, is the bread. This place is loads better than the bakery outside the Mekong Market and their curry pan is downright sexy.
This is a great place to take someone who has never experienced being in a bakery before (as supermarkets seem to dominate this country, and especially Maricopa county) as the smells began to swirl around your head the moment you walk in.
They have items for just over a dollar (little chocolate buns, sweet bean paste trifles and the like) and even make sandwiches for 6 or 7 bucks, which are made in the traditional Japanese style, but didn't impress enough for a second try.
A freshly made loaf of bread here is a must. If you grew up eating Aunt Hattie's or Wonderbread your brain might bleed out of your ears after trying something hot from Arai.
As a final note, this place is sort of hard to find. You can use the Dunkin Donuts as a land mark to make sure you're in the right place. There is also a hoagie shop and a computer repair/parts store. Good luck!