I've been here a handful of times and thought it was time I finally left my 2 cents. There really isn't much to say but the service at Osaka is really good. On our most recent visit we ordered sushi and sashimi for 2, and some takoyaki to start.
Sushi in general is not cheap, and when it is, that usually means you'll get a dip in quality. I'd say Osaka is slightly high to average priced. Either way the quality and service more than speaks for itself.
The quality of the sushi was very good. The sushi rice is good, the portions are fair, and they give you really big chunks of sashimi. You can definitely taste the freshness.
But the crown jewel here is the staff. They are all very friendly, make sure to greet you at the door, and take care of your every need. They were so good that even in a fully packed restaurant, we had two waitresses taking our order and and asking if we needed anything else.