168 Sushi is the place to go if you want fair priced all you can eat sushi. I cannot say the sushi quality is the best (it appears to me the sushi quality is decreasing over the years, but still acceptable), but it has the best value for your money.
I think 168 is among the first restaurants that use the ipad ordering system (at least the first restaurant I've been to), it is very easy to use and very efficient. Best part of the system is that you know what you have ordered, and you'll know if they skip your order.
The variety of the food is good and I'm happy with the quantity as well. The sushi rolls are typically 4 pieces, unlike some other places where the rolls are usually 6 to 8 pieces, so you get full very quickly. The small quantity made it possible for us to try more things.