I went with my friend because he was in town from L.A. (former resident), and he raved about Yama Sushi.
It was my first experience here, but I have to say it was "ok".
The restaurant itself was alright. It seemed clean, and for 1pm on a tuesday, it was pretty busy. The AYCE is standard reasonable price. The 4 rolls we started our order with came at LIGHTNING speed, but the taste was....meh.. To me, it tasted less fresh and more refrigerated.
It seems a lot of the reviews swear by it, but maybe it was my mood that day, but it just seemed very "meh" to me.
The service, however, is very attentive. :)
I gave it three instead of 4 only because I probably wouldn't go back on my own (but I would go if goaded.)