I've been to Katsu Sushi many times in the last two years, and it seems to get better and better every time I go.
Great options on the AYCE menu, including an incredible ramen. The maki rolls are expertly prepared.. just the perfect filling to rice ratio (other all you can eat places tend to overdo it with the rice so that you're not getting enough fish/other ingredients). The sashimi was perfectly cut.. well sized, evenly cut slices.
On earlier visits, the service was lacking.. but yesterday we were really impressed by the attentiveness of the staff. It was really excellent.
This is hands down my favorites spot for AYCE. I can't say enough great things about this place!