My BF and I got a Groupon for this place so make sure to check for one before you go!
The servers where incredibly nice/knowledgable and the prices where fair (you get $1 off for veggie options). I got a vegetarian burrito and my BF got the day's special, a sweet pork burrito. We also got a regular sized (which really is a large) guac chips, reg sized queso chips, a soda and a cookie because we had to use up the entire value of our coupon at once. Everything is put on super sturdy metal dished so it's great for takeout!
The dips for the chips where massive! I love guac, so for me that was heaven. They have one of those cool soda mashies where you can create any type of drink you want so we had the decaf-diet-orange-Coke.
Only cons where that my whole wheat wrap was strangely sweet and that there where no truly spicy sauces. This place is great for what it is, a fast food joint. However, it's not a genuine Mexican place (not that we expected it to be) of which there are many in Tempe.