After "testing the waters" at other pilates studio, I can truly say this is the best in the PHX valley!
Be prepared for some butt-kicking when you go, the jump-boards are both my most hated, while being most loved things. Christina especially gives you an amazing workout, so much that my friend and I nicknamed her "machina"... seriously best workout in an hour for all over tone/strengthening.
ALL of the instructors are great and with smaller class sizes (about 8) they can give each person individual attention. PLUS they are all about the "safe" way to do things so I always felt assured I wasn't going to leave with an injury- although you will definitely leave sore, it wont be from improper form :-)