When I lived in Mesa this was my all time favorite bead place. I've skimmed some other reviews and I agree the -put your purse in a locker is a bit odd, but my jackpot finds always made it worthwhile.
It's a single room shop with lockers in the front to put your things in. Beads lining all walls plus long tables covered in strands and containers with beads and findings. They frequently have amazing sales where you can get things for 40-60 % off.
The selection is great with tons of options in seed beads, crystals, and precious stones. Both precious and non precious findings. And a lot of variety of just other interesting things you didn't even know you needed!
I definitely miss this place and would recommend it to anyone living in the area.