Yama is a solid sushi spot. Most of the sushi places I've been to in Charlotte are fun and personable in their own ways - but they often have some kind of gimmick (music, scene, eclectic menu) and "ok" sushi. Yama is nice, streamlined, professional - seeming to focus on good food.
At the recommendation of our waitress, I had the HM roll and loved it. I sampled a few of my fellow diners' rolls too and all were good. Most of the rolls on the menu were about $10-14.
Atmosphere is nice - quiet and modern, lots of wood, local art on the walls. Service was great. They were very responsive, subtle and perfect on timing.