There are many AMPs in town, but generally they vary from good to "What's this?" My favorite activity at times is to visit and take a business card or just ask for prices.  Usually the one that answers the door is the one you get and there are a lot of old ladies there.  Sometimes you get lucky and find something you like, but that's generally not common.

There was a great Thai group in Gilbert/Chandler.  If that is the Mamasan you are referring to, then I am saddened because they were a good group.  However, she tends to keep her operation mobile.  That is, she changes apartment complexes every 6 months to a year.  Quite smart in that line of work.  A quick look at the Phoenix reviews for Asians shows there are other reliable groups about.  Take a look at "search reviews" and select "Phoenix" and "Asians" for ethnicity.  I think you'll find there is no shortage of Asians in Phoenix.